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HyperWorks Solvers 13.0.212 Release Notes 1 Proprietary Information of Altair Engineering HyperWorks Solvers 13.0.212 Release Notes OptiStruct Introduction Altair OptiStruct is an industry proven, modern structural analysis solver for linear and non-linear mechanical problems under static, dynamic, and thermal loads. It is the market-leading solution for structural design and optimization. Based on finite-element and multi-body dynamics technology, and through advanced analysis and optimization algorithms, OptiStruct helps designers and engineers rapidly develop innovative, lightweight and structurally efficient designs. OptiStruct is used by thousands of companies worldwide to analyze and optimize structures and mechanical systems for strength, durability, noise and vibrations, heat transfer, as well as impact. This is a hotfix release which contains all the features of 13.0.211 and additionally introduces 6 new enhancements and fixes 16 issues. Enhancements The 64-bit Sparse Direct Solver can now be activated using a command line option The –i64slv command line option is now available to activate the 64-bit Sparse Direct Solver. Additionally, this solver will also be activated automatically if a large memory value (> 16GB) is specified using the –len run option. Select RADIOSS version for Equivalent Static Load (ESL) Optimization The –v_rad command line option can now be used to select the RADIOSS version for Equivalent Static Load (ESL) Optimization. The GRID coordinates can be directly input on PARAM, GRDPNT The GRID coordinates can now be directly input on PARAM, GRDPNT instead of the GRID Identification number.

HyperWorks Release Notes - Altair · 2015-04-28 · Composite failure additions Resolved Issues Highlights Lattice Structure Optimization OptiStruct now offers a novel solution to

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HyperWorks Solvers 13.0.212 Release Notes 1

Proprietary Information of Altair Engineering

HyperWorks Solvers

13.0.212 Release Notes

OptiStruct

Introduction

Altair OptiStruct is an industry proven, modern structural analysis solver for linear and non-linear

mechanical problems under static, dynamic, and thermal loads. It is the market-leading solution for

structural design and optimization. Based on finite-element and multi-body dynamics technology, and

through advanced analysis and optimization algorithms, OptiStruct helps designers and engineers rapidly

develop innovative, lightweight and structurally efficient designs. OptiStruct is used by thousands of

companies worldwide to analyze and optimize structures and mechanical systems for strength, durability,

noise and vibrations, heat transfer, as well as impact.

This is a hotfix release which contains all the features of 13.0.211 and additionally introduces 6 new

enhancements and fixes 16 issues.

Enhancements

The 64-bit Sparse Direct Solver can now be activated using a command line option

The –i64slv command line option is now available to activate the 64-bit Sparse Direct Solver. Additionally,

this solver will also be activated automatically if a large memory value (> 16GB) is specified using the –len

run option.

Select RADIOSS version for Equivalent Static Load (ESL) Optimization

The –v_rad command line option can now be used to select the RADIOSS version for Equivalent Static

Load (ESL) Optimization.

The GRID coordinates can be directly input on PARAM, GRDPNT

The GRID coordinates can now be directly input on PARAM, GRDPNT instead of the GRID Identification

number.

HyperWorks Solvers 13.0.212 Release Notes 2

Proprietary Information of Altair Engineering

Large Shape changes in Shape Optimization are now supported for Nonlinear Analysis

Large Shape changes are now supported for Nonlinear Analysis for a structure that contains N2S contact,

CGAP and CGAPG elements. Earlier only Linear Analysis was supported for Large Shape changes in Shape

Optimization.

Density, Thermal Expansion, Reference Temperature, and Poisson’s Ratio are now available

for Hyperelastic Materials (MATHE)

Density, Thermal Expansion, Reference Temperature, and Poisson’s Ratio input are now available via the

RHO, TEXP, TREF, and K fields for Hyperelastic Materials (MATHE) for Large Displacement Nonlinear

Analysis.

The number of Directories in which Scratch files can be written has now been increased from

5 to 20

The Directories in which Scratch files can be written is specified using the TMPDIR entry. Now the number

of TMPDIR entries that can be specified in the input file has been increased from 5 to 20. So a total of 20

Scratch Directories can now be used for an OptiStruct run.

Enhanced parameters

GAPPRM, GRDPNT: The GRID coordinates can now be directly input on PARAM, GRDPNT instead

of the GRID Identification number.

Enhanced bulk data entries

MATHE:

The RHO, TEXP, TREF, and K fields are now available to specify Density, Thermal Expansion, Reference

Temperature, and Poisson’s Ratio.

New and Enhanced Run options

-i64slv: This new command line option can be used to activate the 64-bit Sparse Direct Solver.

-len: This command line option can now be used to activate the 64-bit Sparse Direct Solver if a

memory greater than 16 GB is specified.

-v_rad: This command line option can be used to select the RADIOSS version for Equivalent

Static Load (ESL) Optimization.

Resolved Issues

The Equivalent Plastic Strain in RADIOSS optimization was inactive, this has now been added.

For Lattice Optimization, if an RBE3 is attached to an RBE2 that is attached to the lattice design

space, the -<filename>_lattice.fem file did not contain the correct RBE3 elements. This has now

been fixed.

HyperWorks Solvers 13.0.212 Release Notes 3

Proprietary Information of Altair Engineering

For Nonlinear Large Displacement Analysis, a programming error occurred if the dependent

degrees of freedom are specified as 123 in an RBE3. This has now been fixed.

Residual Vectors (RESVEC) were generated on independent degrees of freedom of Multipoint

Constraints (MPC) even if Single Point Constraints (SPC) are applied on them. This has now been

fixed and RESVEC’s are not calculated for such degrees of freedom.

The application of temperature loading in a model with Pretensioned Bolts led to an error (4800).

This has now been fixed.

In the .out file, an extra space was present before the label “Design Volume Fraction”. This extra

space has now been removed.

A programming error (251) occurred if Element Kinetic Energy (EKE) is requested in Normal

Modes subcases during optimization and HyperMesh output is requested. This has now been

fixed.

The .prop file from an optimization job was incorrectly written out when ECHO=NONE. This has

now been fixed.

During Free-Shape optimization with Pretension Bolts, ERROR 2 occurred. This has now been

fixed.

Negative GRID ID’s were present for GPFORCE, GPSTRESS, MPCFORCE, and SPCFORCE in .pch

or .op2 file when the model contains pretension bolts. This resulted in post-processing issues and

has now been fixed. These negative GRID ID’s have now been removed.

A programming error occurred if static loading was referenced in transient analysis. This has now

been fixed.

A blank line has now been removed from the PUNCH stress output for TETRA/PENTA elements.

Size optimization runs with many design variables and design variable to property relationships

were running slow in some cases. This has now been fixed by enhancing sensitivity calculation

speedups and the runtime has been improved.

In Heat Transfer runs using the MAT5 entry, an issue occurred during material coordinate

transformations. This has now been fixed.

The results were incorrect for Inertia Relief analysis with AUTOSPC degrees of freedom. This

issue has now been fixed.

A Warning indicating that thickness is zero for some composites (Warning 1569) was incorrectly

output during shuffling optimization. This has now been fixed.

HyperWorks Solvers 13.0.212 Release Notes 4

Proprietary Information of Altair Engineering

HyperWorks Solvers

13.0.211 Release Notes

OptiStruct

Introduction

Altair OptiStruct is an industry proven, modern structural analysis solver for linear and non-linear

mechanical problems under static, dynamic, and thermal loads. It is the market-leading solution for

structural design and optimization. Based on finite-element and multi-body dynamics technology, and

through advanced analysis and optimization algorithms, OptiStruct helps designers and engineers rapidly

develop innovative, lightweight and structurally efficient designs. OptiStruct is used by thousands of

companies worldwide to analyze and optimize structures and mechanical systems for strength, durability,

noise and vibrations, heat transfer, as well as impact.

This is a hotfix release which contains all the features of 13.0.210 and additionally introduces 1 new

enhancement and fixes 2 issues.

General

The default scratch file extension can now be changed using an environment variable

The environment variable, OS_SCRATCH_EXT, can now be used to change the default scratch file

extension. The default extension is .rs~.

Resolved Issues

An issue where the Contact status for Surface-to-Surface (S2S) Contact in Domain

Decomposition Mode (DDM) was incorrect has now been fixed.

Response Spectrum input with DTI, SPECSEL requires the damping value to be specified in the

units of critical damping. An issue where the damping with TABDMP1 had units other than critical

damping lead to incorrect results. This has now been fixed by internally converting the damping

values into critical damping.

HyperWorks Solvers 13.0.212 Release Notes 5

Proprietary Information of Altair Engineering

MotionSolve

Introduction

MotionSolve is a state-of-the-art multi-body solver available in HyperWorks. It has a complete set of

modeling elements and powerful numerical methods to support a full set of analysis methods. The

accuracy, speed and robustness of MotionSolve have been validated through extensive testing with

customer models and test data. MotionSolve also offers unmatched compatibility with ADAMS/Solver

input.

This is a hotfix release which contains all the features of 13.0.210 and additionally introduces 1 new

update.

Notes

With this hotfix release, for any models using the DSTIFF integrator with the index set to 2 (SI2), the

solver will instead use the DSTIFF integrator with index set to 1 (SI1). Velocity states are not checked for

integration error (dae_vel_ctrl = “FALSE”) in this case.

HyperWorks Solvers 13.0.212 Release Notes 6

Proprietary Information of Altair Engineering

HyperWorks Solvers

13.0.210 Release Notes

OptiStruct

Introduction

Altair OptiStruct is an industry proven, modern structural analysis solver for linear and non-linear

mechanical problems under static, dynamic, and thermal loads. It is the market-leading solution for

structural design and optimization. Based on finite-element and multi-body dynamics technology, and

through advanced analysis and optimization algorithms, OptiStruct helps designers and engineers rapidly

develop innovative, lightweight and structurally efficient designs. OptiStruct is used by thousands of

companies worldwide to analyze and optimize structures and mechanical systems for strength, durability,

noise and vibrations, heat transfer, as well as impact.

This release introduces 31 new features and enhancements and fixes 10 issues. The major items are:

Lattice Structure Design and Optimization

CONTACT and TIE interface improvements and additions

Composite failure additions

Resolved Issues

Highlights

Lattice Structure Optimization

OptiStruct now offers a novel solution to create blended Solid and Lattice structures from concept to

detailed final design. This technology is developed in particular to assist design innovation for additive

manufacturing (3D Printing). The solution is achieved through two optimization phases. Classic Topology

Optimization is carried out in Phase I, albeit reduced penalty options are provided to allow more porous

material with intermediate densities to exist. In Phase II, porous zones from Phase I are transformed into

explicit lattice structures. Lattice member dimensions are then optimized in the second phase, typically

with detailed constraints on stress, displacements and so on. The final result is a structure blended with

solid parts and lattice zones of varying material volume. For this release two types of lattice cell layout are

offered: tetrahedron and pyramid/diamond cells derived from tetra and hexa meshes, respectively.

Currently, the lattice cell size is directly related to the mesh size in the model.

It should be noted that typically porous material represented by periodic lattice structures exhibits lower

stiffness per volume unit compared to fully dense material. For tetrahedron and diamond lattice cells the

homogenized Young's modulus to density relationship is approximated as E = ρ1.8E0, where E0 denotes

Young's modulus of the dense material. Varying levels of lattice/porous domains in topology results are

HyperWorks Solvers 13.0.212 Release Notes 7

Proprietary Information of Altair Engineering

controlled by the parameter POROSITY. With POROSITY defined as LOW the natural penalty of 1.8 is

applied, which would typically lead to a final design with mostly fully dense material distribution if a simple

'stiffest structure' formulation (compliance minimization for a given target volume) is applied. However,

the user may favor higher proportion of lattice zones in the design for considerations other than stiffness.

These can include considerations for buckling behavior, thermal performance, dynamic characteristics,

and so on. Also for applications such as biomedical implants porosity of the component can be an

important functional requirement. For such requirements, the user can choose two different options for

POROSITY. At HIGH, no penalty is applied to Young's modulus to density relationship, typically resulting

in a high portion of lattice zones in the final results of Phase 1. At MED a reduced penalty of 1.25 is applied

for a medium level of preference for lattice presence.

It should also be pointed out that it should be important to consider all design constraints during Phase 2

of the optimization process. This is because if the user expects the design to be '3D printed' directly from

the final design, it has to sustain the use case. For traditional structures users usually go through a second

stage where the topology concept is interpreted and then fine-tuned by size and shape optimization with

all design constraints included. The second phase of the lattice optimization process should be seen as the

fine tune stage for the design since further manual manipulation of a lattice structure with hundreds of

thousands cell members is close to impossible.

Lattice Structure Optimization currently doesn’t support global-local analysis, Heat transfer analysis,

Fluid-structure interaction, and multi-model optimization. Shape, Free-Size, Equivalent static load,

Topography, and level-set optimization are also not supported in conjunction with Lattice optimization.

New parameter data

DOPTPRM, POROSITY: This parameter can be used to control the porosity (amount of

intermediate densities) in the model for Lattice Structure optimization. It internally controls the

penalty value that penalizes intermediate densities. The HIGH, MED, and LOW options can be

used to specify the porosity value. HIGH, MED, and LOW porosity settings are used for high,

medium, and low intermediate densities in the model. The internal penalty value remains

constant during the optimization run.

DOPTPRM, LATLB: The parameter DOPTPRM, LATLB, AUTO can be used to turn ON the

automated reanalysis and USER (default) turns OFF the reanalysis process (user specified LB is

used). A third option CHECK can be used to run a single reanalysis iteration and it will output a

warning which contains the percentage difference in compliance between the original and the

reanalyzed structure. The CHECK option can be used to gain information about the compliance

performance of the structure using the specified LB. If the compliance performance is not as

expected, then the user may consider rerunning Phase 1 using AUTO to possibly find a better

density Lower Bound (LB).

DOPTPRM, PNORM: The parameter DOPTPRM, PNORM specifies the value of the power (or

penalty) p , used in the Stress NORM method for stress response calculation in Lattice Structure

Optimization.

Enhanced bulk data

DTPL: The LATTICE continuation line has been added to specify parameters for Lattice Structure

Optimization. The LT field can be used to specify the Lattice Type. The LB and UB fields can be

used to specify the density bounds within which elements are converted into Lattice structures.

The LATSTR field can be used to specify the stress constraint upper bound that is passed to Phase

2 of the lattice optimization process. The Stress NORM method is used to apply the specified

stress constraints to the optimization process.

HyperWorks Solvers 13.0.212 Release Notes 8

Proprietary Information of Altair Engineering

Stiffness, Strength and Stability

HASHIN Composite Failure Criteria

The HASHIN Composite Failure Criteria can be used to calculate four different failure modes for the fiber

and matrix (Tensile fiber, Compressive fiber, Tensile matrix, and Compressive matrix). The HASHIN

Criteria are now available to calculate Failure Indices for Composite Models. The FT field can be set to

HASH on PCOMP, PCOMPP, or PCOMPG to select these failure criteria. The material parameters, Xt, Xc, Yt,

Yc, S on the MAT8 Bulk Data Entry should be provided. Optimization runs using the HASHIN criteria can

be specified using the HASH failure code on the DRESP1 Bulk Data Entry.

CFAILURE entry to output Failure Indices

The CFAILURE entry can be used to output Failure Indices for elements referencing PCOMP, PCOMPG, and

PCOMPP (with STACK) properties for all static subcases or individual static subcases respectively. The

NDIV field is also available to request failure indices for multiple planes within each ply.

Composite Stresses and Strains can be calculated for multiple planes within each ply

Composite Stresses and Strains can be calculated for multiple planes within each ply using the NDIV field

on the CSTRESS and CSTRAIN Bulk Data Entries.

Stabilization Control of Surface-to-Surface Contact and Large-Displacement Node-to-Surface

Contact

Contact Stabilization can now be applied to Surface-to-Surface Contact and Large Displacement

Node-to-Surface Contact to improve nonlinear convergence. The CNTSTB Subcase Information Entry can

be used to reference a CNTSTB Bulk Data Entry which specifies the various Contact Stabilization

Parameters. The parameters defined on a CNTSTB Bulk Data Entry override the PARAM, EXPERTNL,

CNTSTB (if specified) in the referenced subcase. Contact Stabilization is available only for Nonlinear

Quasi-Static Analysis subcases.

Contact Smoothing for Surface-to-Surface Contact

Contact Smoothing can now be applied to the master and slave surfaces in a Surface-to-Surface contact.

The optional SMOOTH continuation line can be used on the CONTACT Bulk Data Entry to activate

smoothing. The SMSIDE field can be used to select if smoothing is applied to the master or slave side.

Additionally, SMREG can be used to select a particular region of the Master or Slave surface to apply the

smoothing. The initial contact opening, contact pressure, and element stress results are generally

improved after contact smoothing is applied.

Frictional Offset is now available for Surface-to-Surface Contact Analysis

GAPPRM, GAPOFFS can now be used to control frictional offset for Surface-to-Surface Contact Analysis.

The YES option turns ON frictional offset for surface-to-surface contact elements in Linear Analysis and

HyperWorks Solvers 13.0.212 Release Notes 9

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small-displacement nonlinear analysis. The NO option turns it OFF for Linear Analysis and

small-displacement nonlinear analysis. The AUTO option turns it ON for Linear Analysis and OFF for

small-displacement nonlinear analysis. Frictional offset is always turned on for large displacement

nonlinear analysis.

Contact Stiffness Scaling Factor is now available

A Contact Stiffness Scaling Factor can now be specified on the STIFF field of PCONT Bulk Data Entry, on

CONTPRM, STIFF, or the KA field on the PGAP Bulk Data Entry. The scaling factor can be specified as a

negative real number which is used to directly scale the automatic stiffness value (STIFF/KA=AUTO).

Additionally, a positive real number on the STIFF/KA fields can now be specified to directly prescribe the

stiffness value for the contact interface.

MPC-based TIE contact is now available

A new Multi-point Constraint based TIE contact is now available for two surfaces in contact. It is controlled

using CONTPRM, TIE, MPC. Including the new MPC-based formulation, there are now two types of TIE

contact. They can be switched using CONTPRM, TIE. The penalty-based method can be applied using

CONTPRM, TIE, PENALTY. In the new formulation, the MPC’s can be output to <filename>_contmpc.fem

using CONTPRM, CONTMPC, YES.

SPCFORCE output is now available in the .op2 file

SPCFORCE output is now available for modal analysis in the .op2 file.

RBE3 and Pretension Bolt Analysis are now supported in Large Deformation Nonlinear Static

Analysis

RBE3 elements and Pretension Bolt analysis are now supported in Large Deformation Nonlinear Static

Analysis.

End load output for Static Subcases

End loads can now be output for static subcases using the ENDLOAD I/O Options Entry. This outputs end

loads as corner values associated with element edges. For 1D elements, end loads are forces along the

length of the element. For 2D elements, end loads are forces calculated along the element edges between

two grid points. For example, if end loads are output between grid points 1 and 2, then the force output

at 1 is equal to the force along the element (or edge) from grid 1 to 2 and the force output at 2 is equal

to the force along the element (or edge) from grid 2 to 1. These two end loads at two adjacent grid points

for a particular element are not necessarily equal to each other. ENDLOAD is available only for static

analysis subcases. Additionally, PARAM, XPOST can be used to create the .elfo (element forces), .elsh

(element shear), and .endl (end loads) output files.

Automatically Constrain free Degrees-of-Freedom after Constraint Reduction

The parameter PARAM, AUTOSPC2 is used to control automatically constraining the degrees-of-freedom

with no stiffness after Constraint Reduction. If YES, after constraint reduction, the global stiffness matrix

is checked for degrees-of-freedom with no stiffness. If found, these degrees-of-freedom are automatically

constrained. If NO, after constraint reduction, the degrees-of-freedom with no stiffness are not

automatically constrained.

HyperWorks Solvers 13.0.212 Release Notes 10

Proprietary Information of Altair Engineering

Exclude CELAS2, CELAS4, and PELAS entries from PARAM, ELASSTIF stiffness limits

The CELAS2, CELAS4, and PELAS entries can now be converted into CELAS2F, CELAS4F, and PELASFX

entries to exclude them from the stiffness limits enforced by PARAM, ELASSTIF.

New and Enhanced parameters

GAPPRM, GAPOFFS: A new parameter, GAPPRM, GAPOFFS can now be used to activate frictional

offset for Surface-to-Surface Contact Analysis.

CONTPRM, STIFF: A negative real number can now be specified to define a scaling factor to

directly scale the automatic stiffness value.

CONTPRM, TIE: A new parameter, CONTPRM, TIE can be used to select the contact formulation

for TIE contact. The PENALTY and MPC options are available.

CONTPRM, CONTMPC: A new parameter, CONTPRM, CONTMPC can be used to output internally

created MPC’s used to generate the MPC-based TIE contact.

PARAM, XPOST: A new parameter, PARAM, XPOST can be used to create the .elfo (element

forces), .elsh (element shear), and .endl (end loads) output files.

PARAM, AUTOSPC2: A new parameter, PARAM, AUTOSPC2 can be used to control constraining

the free DOFs after constraint reduction

New and Enhanced I/O Options or subcase information entries

CFAILURE: The new CFAILURE entry can be used to output Failure Indices for elements

referencing PCOMP or PCOMPG properties. The NDIV field is also available to output failure

indices at multiple planes within each ply.

CNTSTB: Used to activate stabilization control for Surface-to-Surface Contact and

Large-displacement Node-to-Surface Contact for a specific subcase. It is only available for

Nonlinear quasi-static analysis.

CSTRESS, CSTRAIN: The NDIV field can now be used to output stresses and strains for multiple

planes within each ply.

ENDLOAD: End loads can now be output for static subcases using the ENDLOAD I/O Options

Entry. This outputs end loads as corner values associated with element edges. It is available in

the H3D output format.

New bulk data entries

CNTSTB: Used to specify the parameters for stabilization control of Surface-to-Surface Contact

and Large-displacement Node-to-Surface Contact.

CELAS2F, CELAS4F, PELASFX: Used to exclude the corresponding CELAS2, CELAS4, and PELAS

entries from the stiffness limits set by PARAM, ELASSTIF.

Enhanced bulk data entries

CONTACT:

HyperWorks Solvers 13.0.212 Release Notes 11

Proprietary Information of Altair Engineering

The SMOOTH continuation line has been added to activate contact smoothing.

The SMSIDE field can be used to select either the Master side or Slave side for smoothing.

The SMREG field can be used to select a specific region of the Master or Slave surfaces for smoothing.

PCONT:

The STIFF field can now be used to input a negative real number to define a scaling factor to directly

scale the automatic stiffness value.

PGAP:

The KA field can now be used to input a negative real number to define a scaling factor to directly scale

the automatic stiffness value.

PCOMP, PCOMPP, PCOMPG:

The HASH field has been added to activate Hashin Failure Criteria.

DRESP1:

The HASH composite failure item code can now be used on the ATTA field to activate Hashin Failure

Criteria for optimization runs.

Noise and Vibrations

Superelements can be used in Rotor dynamics Analysis

Superelements can now be used in Rotor dynamics Analysis. Superelements can now be attached to the

grids that define the rotor in the ROTORG Bulk Data Entry. Craig-Bampton Nodal Formulation (CBN) or

Guyan Reduction (GUYAN) can be specified on the METHOD field in the CMSMETH Bulk Data Entry to

generate the superelements. The superelement replaces the beam elements used to model the rotor. The

ASET grid points should correspond to the GRIDi points specified on the ROTORG bulk data entry. The

interface grid points of the superelement used to model the rotor should be exactly the same grid points

defined on the ROTORG entry. The General Modal Formulation (GM method) cannot be used to generate

superelements for Rotor dynamics.

Hybrid Damping is now available in Rotor dynamics Analysis

Hybrid Damping is now available in Rotor dynamics for Frequency Response and Complex Eigenvalue

Analyses. The HYBRID field on the RSPINR entry refers to a HYBDAMP bulk data entry to define hybrid

damping. The HYBDAMP bulk data entry can be used to include either viscous hybrid damping (KDAMP =

NO/default) or material hybrid damping (KDAMP = YES). Additionally, if PARAM, GYROAVG, -1 is

specified, then PARAM, WRH can be used to specify an average excitation frequency value as a scaling

factor to the Hybrid Damping matrix that is used to bypass frequency-dependent looping.

Multiple modal spaces are now supported for Modal Transient or Modal Frequency Response

Analysis with AMSES or AMLS

Multiple subcases with different boundary conditions (SPC, MPC, and METHOD) for normal mode analysis

with AMSES/AMLS was supported in OptiStruct 13.0. This has now been enhanced to allow multiple

boundary conditions for Modal Transient/ Modal Frequency Response Analysis with AMSES or AMLS.

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Grid Point Stresses are available for Frequency Response Analysis

Grid Point Stresses are available for both Direct and Modal Frequency Response Analysis. GPSTRESS

output is available for solid elements in H3D and PUNCH formats only.

ERP Grid Contribution calculation has now been improved

The Equivalent Radiated Power grid contribution (ERP (GRID)) calculation has been improved by taking

into account the associated nodal area for each grid on the panel and the parameters: Speed of sound

(ERPC), fluid density (ERPRHO), and the radiation loss factor (ERPRLF).

Powerflow Output is now available for CELAS elements

Powerflow Output indicates the magnitude and direction of the vibrational energy traveling in dynamically

loaded structures. The POWERFLOW I/O Options entry can now be used to request Powerflow output for

CELAS1, CELAS2, CELAS3, and CELAS4 elements.

New parameter data

PARAM, WRH: This is a new parameter that can be used to specify an average excitation

frequency value as a scaling factor to the Hybrid Damping matrix that is used to bypass

frequency-dependent looping.

Enhanced bulk data entries

RSPINR:

- The HYBRID field references the identification number of a HYBDAMP entry to include Hybrid

damping in Rotor Dynamics.

Kinematics and Dynamics

Nonlinear Transient Loads are now supported in Modal Transient Analysis

Nonlinear Transient Loads are now supported in Modal Transient Analysis. NOLIN1, NOLIN2, NOLIN3, and

NOLIN4 can now be used to define nonlinear loads in Modal Transient Analysis. Nonlinear transient loads

are not supported on scalar points (SPOINT), so the GI field cannot reference an SPOINT identification

number.

OTIME is available for Transient Response Analysis by Fourier Transformation

OTIME is now supported for output from a Transient Response Analysis by Fourier Transformation. Any

supported transient analysis results will now be output only for a set of times specified using the OTIME

I/O Options and Subcase Information Entry.

Separate .spcd files are created for multiple DMIG’s

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Separate .spcd files are generated for multiple DMIG’s in the residual run. A separate

<filename>.<dmigname>.spcd file is generated for each H3D DMIG input in the residual run. These .spcd

files can be used for result recovery on the interior points of each complete DMIG.

Displacements and modal participation are output for Transient Response Analysis by Fourier

Transformation

Displacements are now output in the frequency domain for Transient Response Analysis by Fourier

Transformation using the DISP (FREQ) request. The FREQ and TIME options have now been added to the

DISP I/O Options entry to request displacement results in the frequency and time domains, respectively.

Both FREQ and TIME options can be used simultaneously if both results are required. Additionally, the

modal participation displacement results are available via the SDISP output request for Modal Transient

Response Analysis by Fourier Transformation.

New solver and simulation parameters for Multi-body Dynamics (OS-MBD)

New parameters have been added for additional control over the OS-MBD solution. The MBSIM bulk data

entry is enhanced with additional fields DJACINI and DINTRPL. DJACINI can be used to control the

Jacobian matrix evaluation during corrector iterations and DINTRPL can be used to specify whether the

integrator uses interpolation for the results at the output steps. The TLIMIT and ALIMIT fields are not

supported anymore and STBLT, COMPDEL fields have been added. STBLT specifies the fraction of the the

mass matrix that is to be added to the Jacobian to ensure that it is not singular. COMPDEL is the delta

value used during compliance matrix calculation.

The MBLIN bulk data entry has been enhanced with additional fields ENGYDST, PID_IN, PID_OUT, and

NODAMP. ENGYDST specifies whether the modal kinetic energy distribution is written out to the solver log

file and the *_linz.mrf output file. PID_IN specifies the plant input ID used for the B and D state

matrices. PID_OUT specifies the plant output ID used for the C and D state matrices. NODAMP specifies

whether the linearization solver disables damping from all force elements for the eigenvalue solution.

Enhanced I/O Options and Subcase Information data

DISPLACEMENT: A new FOURIER argument is now available on the DISPLACEMENT I/O Options

entry. The TIME and FREQ options are now available to output displacements in the time and

frequency domain, respectively, for Transient Response Analysis by Fourier Transformation.

Enhanced bulk data entries

MBSIM: DJACINI, DINTRPL fields have been added to allow additional control over the OS-MBD

solution control parameters. The TLIMIT and ALIMIT fields are not supported anymore, and

STBLT, COMPDEL fields have been added.

MBLIN: ENGYDST, PID_IN, PID_OUT, NODAMP fields have been added to allow additional control

over the OS-MBD solution control parameters.

General

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A SET of Elements can now be selected to be Included in (or Excluded from) Element Quality

Check

PARAM, CHKELSET, <integer> can now be used to include or exclude a set of elements from element

quality check. A positive integer references a set of elements that is included in element quality checks

and all other elements are excluded. A negative integer references a set of elements that is excluded from

element quality checks and all other elements are included.

The default value for PARAM, RENUMOK is now set to YES

Solid elements with incorrect sequence of grid numbers will now be automatically re-sequenced to the

correct order as the default for PARAM, RENUMOK has been set to YES.

Separate .spcd files are now generated for each DMIG

Separate <filename>_<dmigname>.spcd files are now generated for each H3D DMIG in the model.

New parameter data

PARAM,CHKELSET: can now be used to include or exclude a set of elements from element quality

checks.

Optimization

Large Shape Changes are now allowed during Shape Optimization for Weld elements and

Contact

Shape Optimization is now also supported for models with CGAP, CGAPG, CFAST, CSEAM, and CWELD

elements. It is also supported for Node-to-Surface Contact. Large shape changes in the contact interface

surfaces during shape optimization are now supported. The shape changes of the slave and master

surfaces in contact are updated for each iteration during shape optimization. It is now supported for

Linear contact (N2S contact and Penalty-based TIE are only supported. MPC-based TIE contacts are not

supported) and is only supported for linear static subcases (excluding buckling analysis).

Grid locations can be specified in a user-defined coordinate system using DGRIDL

The DGRIDL VARTYPE# fields on DRESP2 and DRESP3 entries can be used to specify the identification

number of a user-defined coordinate system (CID) along with the Grid ID’s (GID) and the Component (C).

The Internal Constraints of PBARL, PBEAML properties can now be controlled

DOPTPRM, BARCON can now be used to control the internal constraints of PBARL and PBEAML properties.

Two options are available: REQUIRED: A required set of constraints are applied. This option prevents

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situations which are geometrically infeasible, EXTENDED: Applies and extended set of constraints. This

option also enforces positive dimensions in addition to the constraints applied by REQUIRED.

Content of .hgdata and .hist optimization output files has been enhanced

The content of the .hgdata and .hist optimization output files have been enhanced. Specifically, the

DRESP1 user ID’s and DRESP2/3 subcase ID’s have been added to the labels wherever applicable to

enhance user experience.

Enhanced HyperWorks Solver View Window Information

The HyperWorks Solver View Window has been improved by now displaying the output value of the last

iteration without having to use the mouse-over functionality. Additionally, the Graph button has been

repositioned to improve its visibility.

Output Density results only for Topology design elements

The DENSITY(TOPO) = SID command can now be used to output Density results only for Topology design

elements. A set ID (SID) can also be provided to output density results for topology design elements

within a specified SET.

New parameter data

DOPTPRM,BARCON: can now be used to control the internal constraints of PBARL and PBEAML

properties.

Enhanced I/O Options and Subcase Information data

DENSITY: A new Type option, TOPO is now available on the DENSITY I/O Options entry to

output density results for topology design elements. The SID option has also been added to

specify a SET of elements.

Resolved Issues

The ERROR 605 message has been improved to specify the PLY’s and STACK’s where the issue

occurs to help fix it faster.

A WARNING message is now added for models containing PBARL or PBEAML with TYPE = HEXA

with irregular sides. The message explains that the torsional constant (J) is approximate for

irregular HEXA sections.

An issue where the 1-D element force output requested in the elemental system was incorrectly

output in the basic system has now been fixed. The 1-D element forces are now correctly

visualized in any system (Analysis, Global, and User-defined coordinate system).

An issue where the nodal contact forces were incorrectly output when the local coordinate system

is assigned on contact grids (CD field on GRID entry) has now been fixed. Nodal contact force

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vectors are now correctly output and further visualization in HyperView is accurate in any system

(Analysis, Global, and User-defined coordinate systems).

PARAM, SHL2MEM is not applied if the Thickness (T) field on the PSHELL entry is blank. Shells

with blank PSHELL thickness fields will not be converted into membranes when PARAM,

SHL2MEM is used.

A WARNING message is now output that directs users to check for excessively distorted mesh

elements in terminated Topography optimization runs.

An INFORMATION message is now always output in all cases to the .out file indicating if the

FASTFR solution is ON or OFF, regardless of whether PARAM, FASTFRS and/or PARAM, FASTFR

are defined or not.

A NOTE is now added to the .out file suggesting the use of PARAM, CONTFEL, YES for

node-to-surface contact with 2nd order solid elements.

A dummy MATS1 Bulk Data Entry is not required for Nonlinear Large Displacement Analysis if

linear material is used.

The printing of the number of contact elements in the .out file are now segregated by type. For

example, the following output is available:

If there is no contact:

Total # of Elements : xx

If there is contact:

Total # of Elements Excluding Contact: xx

Total # of N2S Contact Elements : xx (internally created CGAP)

Total # of N2S Contact Elements : xx (no internally created CGAP)

Total # of S2S Contact Elements : xx (no internally created CGAP)

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HyperXtrude

Introduction

Altair HyperXtrude is an advanced solver for manufacturing process simulations and validations. Highly

robust, accurate and easy to use, HyperXtrude provides the best and well customized simulation solutions

for metal extrusion, polymer extrusion, billet forging, friction stir welding, metal rolling, and resin transfer

molding. As the pioneering technology in manufacturing process simulation, HyperXtrude accurately

simulates the material flow and heat transfer during manufacturing processes allowing the users to

significantly reduce die design time and costly die tryouts. Its feature rich environment provides value

and usefulness to all levels of users from shop floor engineers, analysts, to researchers.

This release introduces 1 new feature and fixes 1 issue.

Metal Extrusion

The SI version of the H3D results file is now output. This file is required to visualize results in the

HyperXtrude 2015 interface. This SI file is output in addition to the standard result file in user specified

units and can be turned off using a control parameter.

Resolved Issues

Solver crash due to a “missing scratch file” error has now been resolved. This error occured only

on a few machines due to mismatch in times between close and reopen operations of scratch

files.