HW-10-SA1-206-HWsolvers Release Notes

HW-10-SA1-206-HWsolvers provides updates to the HyperWorks solver suite. This update replaces the HW-10-

SA1-205-HWsolvers update.

RADIOSS Finite element solver for linear and non-linear problems

MotionSolve Multi-body dynamics solver

OptiStruct Design and optimization software using finite elements and multi-body dynamics

HyperXtrude An hp-adaptive finite element for material flow and heat transfer problems in

extrusion and rolling applications

RADIOSS

RADIOSS is a state-of-the-art finite element solver uniting implicit and explicit integration schemes for the solution

of a wide variety of engineering problems, from linear statics and linear dynamics to complex nonlinear transient

dynamics and mechanical systems. This robust, multidisciplinary solver enables designers to maximize

performance related to durability, NVH, crash, safety, manufacturability, and fluid-structure interaction, in order to

bring innovative products to market faster.

RADIOSS 10-SA1-206 again brings much advancement over previous versions, with emphasis in the areas of

performance, frequency response analysis, acoustic response analysis, fatigue analysis, and contact modeling.

RADIOSS Bulk Data Format

New Features

Complex Eigenvalue analysis - The modal method of complex eigenvalue analysis is now available.

- K2PP, CMETHOD and EIGC entries have been added to facilitate this

solution type.

- The presence of the CMETHOD and METHOD data selectors within a

subcase indicate the modal complex eigenvalue solution is required.

Memory trim for AMLS

eigenvalue solution - Memory is released back to the operating system while invoking

AMLS for eigenvalue analysis.

This feature is termed ―Memory Trim‖ and may be deactivated using

PARAM,MEMTRIM,NO.

- AMLS is an external program that requires its own memory and disk

space to perform eigenvalue analysis. Without memory trim, the total

memory requirement (T) to perform eigenvalue analysis using AMLS

was the sum of the memory required by RADIOSS (R), the memory

exclusively allocated for AMLS (A) and other miscellaneous memory

requirements; e.g. MIO library requirement, (M). Thus:

T = R + A + M.

With memory trim enabled, the total memory requirement is reduced

to:

T = max(R,A) + M.

- Memory trim is available only on Windows, LINUX and AIX operating

systems.

Hash-table based assembly

method - An alternative method for assembling global matrices in FEA analyses

is now available. This alternative method lowers the memory

requirement for matrix assembly and may be activated by

PARAM,HASHASSM,YES.

- The hash-table based assembly method reduces the memory

requirement of the assembly module by about a factor of 3 for linear

static analyses, by about a factor of 5 for eigenvalue analyses, and by

about a factor of 7 for frequency response analyses involving material

damping.

- The reduction in the overall memory requirement is problem-

dependant. For problems where modules other than the assembly

module are dictating the overall memory requirement, using this

alternative assembly method will not result in a reduction in the overall

memory requirement.

- Using the hash-table based assembly method while possibly reducing

memory requirements may result in longer run times.

Automatic filtering of results

output for acoustic simulation - A new output control, PEAKOUT, has been added that will

automatically filter results output for acoustic simulations. Through

PEAKOUT a frequency output set is automatically generated based

on a user-defined number of peaks.

Enforced displacements

supported with AMLS solver - Enforced displacements, velocities and accelerations, defined through

the SPCD input definition, are now fully compatible with the AMLS

eigenvalue solver.

Powerflow calculation - This is a post-processing option for FRF analysis, tracking the flow of

vibrational energy that travels in dynamically loaded structures. It

helps with identifying energy transmission paths, vibration sources,

and energy sinks.

- Both powerflow and structural intensity (defined as powerflow per unit

area) results are available as output to the H3D file.

- The I/O Option, POWERFLOW, is used to activate this feature.

Directional mass for bushing

elements - Directional mass may now be defined on the PBUSH and PBUSHT

bushing property definitions.

- This behaves in a similar manner to directional stiffness and damping

options.

Acoustic sources - A new bulk data input, ACSRCE, is now available, allowing acoustic

sources to be represented by scalar loading functions. This removes

the need to model the structural details of devices such as audio

speakers.

Static element deformation - New functionality allowing for enforced axial deformation of one-

dimensional elements for static analysis is now available.

- The functionality is activated by including a new subcase information

entry (DEFORM) in the subcase definition. This subcase information

entry references a bulk data entry of the same name (DEFORM).

Element energy output - The output of Element Kinetic Energy (EKE) and Element Energy

Loss per Cycle (EDE) has been added.

A dmig option allows energies for external superelements to be written

to the .out file.

MATT1 in heat transfer

analysis - Added support for MATT1 for heat transfer solution sequence.

Enhancements

Binary output of grid

participation factors - PFGRID will now output grid participation factors to the H3D file.

Previously, these results were output to the punch file.

Output generalized mass and

stiffness - These are output for each eigenvalue to both .out and .op2 files. In

the .out file, two extra columns have been added to the

eigenvalue/frequency table providing the generalized mass and

stiffness.

Grid point stress for shells

output to MNF file - Grid point stresses are output for both solid and shell elements when

GPSTRESS output request is present in addition to the .mnf file

creation request (OUTPUT, ADAMSMNF).

Changed defaults for MODEL

output - Default for MODEL is NONE when CBN method is used for CMS run.

Output strain energy for

external superelements - Added dmig argument to ESE output request. Energies for external

superelements are written to the .out file.

Review unconnected

structures in HyperMesh - When AMLS fails to run due to unconnected structure in the model.

We will output HyperMesh command files allowing the user to review

the unconnected structures.

*.amls_unconnected.cmf for unconnected structure

*.amls_singularity.cmf for singular grids

Performance improvements

for DMIG generation runs - Several H3D DMIG output improvements have been implemented,

improving the speed and memory usage.

Performance improvements

for MIO on AIX - Several changes were made to the invoke script that will improve

performance with MIO on AIX operating system.

Performance improvements

for acoustic analysis - Adjustments were made to the solution process for acoustic analysis

problems resulting in reduced run-times.

Performance improvements

when using frequency

dependant bushings

- Adjustments were made to the look-up procedure for frequency

dependent bushings resulting in reduced run-times for problems using

PBUSHT input definitions.

Resolved Issues

Fatigue analysis - In version 10.0, if MAT1 cards with MATFAT extensions were not

listed in the input file, in ascending order, by MID, and were not listed

before all other MAT1 cards without MATFAT extensions, an error

termination occurred. This problem no longer occurs.

- The issue related to the processing of stress results for fatigue

analysis has been resolved. This issue was observed in problems

where insufficient RAM allocation required stress data to be stored in

scratch files.

- The repeat number for fatigue sequences now correctly takes effect

when linear super-positioning exists.

Modal participation and AMLS - Modal participation results are now correct when using the third party

AMLS eigenvalue solver.

SDISP output request - Modal participation displacement output (SDISP) to the PUNCH and

OUTPUT2 formats is now correct when the PHASE option is selected.

Structural modal participation

with AMLS - Previously, when running with AMLS, it was necessary to request

displacement output (DISPLACEMENT) for the same grid set for

which modal participation output is requested (PFMODE). This is no

longer necessary.

Limit number of viscous

resvec’s calculated - Too many viscous resvec's can slow down the solution time. A default

limit of 1000 is now established. This limit can be adjusted using

PARAM,MAXDAMP (default=1000). A WARNING message is issued

if MAXDAMP is exceeded and no viscous resvec's are calculated.

Large number of residual

vectors calculated for RBE3

elements when running with

AMLS

- Previously, when running with AMLS, if there was a need to calculate

a residual vector for the dependent degree-of-freedom of an RBE3,

we used to create a residual vector for each independent degree-of-

freedom. This issue was resolved by creating only one residual vector

at the dependent degree-of-freedom.

AMLS generic files written to

and read from AMLSDIR - Previously, the AMLS generic files were written to and read from the

current working directory, often resulting in poor i/o performance. This

issue is resolved and these files are now written to and read from the

AMLSDIR.

Temperature dependent

materials for CTRIA elements - Previously, the determination of the temperature dependent material

properties for CTRIA elements was incorrect. This issue is resolved

and the appropriate material properties are used.

Convection for tetra elements - Previously, there was an issue when convection was applied to side 2

of a tetra element. This issue is resolved.

Flexible body generation - Flexh3d and ADAMS mnf formats do not support local coordinate

systems.

Therefore CMS vectors are now output to these formats with

reference to the basic coordinate system only, instead of the grid’s

output coordinate system.

Requested in-core solution

running as min-core - Corrected undesired behavior where, for large models, a requested in-

core eigenvalue analysis was being run with min-core settings.

Internally generated inertia

relief MPCs being incorrectly

used with other subcases.

- In previous versions, if multiple subcases existed, without MPC

references, and where one subcase was using inertia relief; internally

generated MPCs (used for inertia relief) were incorrectly used in those

subcases that didn’t have an MPC reference.

Output - Numeric labels are now output correctly.

Complex eigenvalue analysis - Error message generated when CMETHOD is not referencing a valid

EIGC entry.

File compression - When performing input file compression (running RADIOSS with –

compress command line option) PCOMP definitions were being

written with negative material ids in previous versions.

CBAR - Gravity and centrifugal loading on CBARs with pin flags was incorrect

in previous versions.

New I/O Option Entries

K2PP - K2PP matrix selector has been added. Selects direct input stiffness

matrices, which are not included in normal modes.

POWERFLOW - POWERFLOW activates powerflow calculation and output.

PEAKOUT - The PEAKOUT command can be used in the I/O Options section to

create an automatic frequency set for output based on the number of

user-defined peaks.

New Subcase Information Entries

CMETHOD - Complex eigenvalue extraction data selector has been added. This

data selector references a EIGC bulk data entry.

DEFORM - Static element deformation data selector has been added. This data

selector references a DEFORM bulk data entry.

New Bulk Data Entries

EIGC - Complex eigenvalue extraction definition has been added.

ACSRCE - Acoustic source definition has been added. Only SLOAD references

are supported.

DEFORM - Static element deformation definition for 1D elements has been

added.

PARAM, MAXDAMP - Limits the number of viscous resvec’s calculated.

PARAM, AMLSASPC - Defines when AUTOSPC is performed when running with the external

eigenvalue solver, AMLS.

PARAM, AMLSUCON - Defines whether or not to automatically constrain out all unconnected

grids when running with the external eigenvalue solver, AMLS.

PARAM, FRIC - Defines a multiplier for K2PP matrix references.

PARAM, MEMTRIM - Activate/Deactivate memory trim when running with the external

eigenvalue solver, AMLS.

PARAM, NEGMASS - Defines whether or not to error out for negative diagonal mass or

inertia terms.

PARAM, HASHASSM - Defines whether or not to use hash-table based assembly method.

Enhanced I/O Option Entries

ESE - Added type and dmig arguments for ESE output control.

Enhanced Bulk Data Entries

PBUSH - Fields for directional masses have been added.

PBUSHT - Fields for mass vs. frequency table references have been added.

Known Issues

DTI,UNITS and superelement

generation - DTI,UNITS input is not supported with CMS nodal formulation.

An error message is generated when DTI,UNITS is present in an input

file requesting generation of CMS superelements.

Conversion factors used for

length, when generating

flexh3d output, are incorrect

- Flexh3d output is only valid with the length unit mm. Therefore we will

error out when units of length other than mm are defined.

PARAM,FLXHW10,YES may be added to the input to avoid this error

termination, but then the resulting flexh3d output is only valid when

used with other HyperWorks 10.0 products where the selected units of

length are the same.

RADIOSS Block Format

New Features

Couplings - RADIOSS to RADIOSS: Multi-domain. Allows you to couple two or

more RADIOSS runs; significant time savings could be obtained, in

case the domains have different time-steps.

- RADIOSS toMadymo MPP – indirect coupling improves scalability.

Elements - Spotweld with HEXA formulation with automatic time step adjustment;

specific material law and failure model is available.

- Spring with tabulated loading/unloading functions.

Contacts - General type20 contact: solves surface to surface, node to surface

and includes edge treatment. It is recommended for solids as it allows

zero-gap contact. It has a softer behavior than type7, which is

designed to solve particular situations where type7 was dropping time-

step or adding mass on nodes. It is available for explicit solution only.

For Non-Linear implicit solution type5 contact is available.

Kinematic conditions - RBE2 element – allows direct mapping of equivalent element in Bulk

Data format.

Materials and failure models - LAW59 (CONNECT) – Connection Material to model spotwelds,

welding lines, etc.

- LAW66 – Visco Elastic Plastic Piecewise Linear Material; allows

separate input for tension and compression; includes strain rate based

on plastic strain rate; it is compatible with /VISC (Prony series).

- LAW72 (HILL_MMC) – Anistropic Hill material law with a modified

Mohr fracture criteria.

- LAW76 – Semi Analytical Model for Polymers (SAMP) with user-

defined functions for the work-hardening portion for tension,

compression and shear (i.e. plastic strain vs. stress).

- LAW82 – Hyper elastic material law. It is compatible with solid

elements only and in can be used to model polymers and elastomers.

- VISC – Viscosity

- TH output for element group

Input/Output

Implicit - Direct data conversion from Bulk Data to Block for RBE2 and RBE3

elements

- New convergence criteria: displacement, force and energy

combination

- Improved performance: new line search method (for analysis W/O

contacts)

- Improved time step control:

1. Fix Points input

2. Divergence Criterion input

Enhancements

Contacts - /INTER/TYPE21 + Thermal conduction

- /INTER/TYPE7: new gap option (lgap=3) enabling gap to be defined

as a function of the mesh size

- /INTER/TYPE20: new flag (Fpenmax) enables releasing the contact if

the penetration is higher than user defined value.

- Improved performance.

/INTER/TYPE11 + /SURF/PART EXT + TETRA10

Materials and failure models - Fabric material (LAW58): initial time step is computed on reference

mesh instead of initial mesh.

- Viscosity (Prony series) is now available in hyper-elastic material

/MAT/OGDEN.

- /MAT/LAW5 + /FAIL/TENSSTRAIN

Input/Output - Reaction force on nodes submitted to BCs

- Pressure (/ANIM/VECT/PCONT) for Type18 Contact Interface

- Number of failed layers in ANIM file for solids

- Stress and strain tensors output for tetra4 and Irot=1

Airbags - Total strain formulation for shells allows you to obtain smoother and

more regular shape for deployed airbags when using Reference

Metrics and Small Strain (LAW19).

- /LAW58 + reference metrics + inflation time > 0 - The new flag ―Isens‖

allows to activate both reference metrics and inflation at a given time,

using the same sensor.

Implicit - Easier data conversion from Bulk Data to Block: RBE2 and RBE3 are

now available (both for implicit and explicit).

- New convergence criteria: Displacement, force and energy

combination

- Improved performance: New line search method

- Improved time step control: Fix point and divergence criterion

- Improved accuracy for buckling analysis: Pressure loading

- Scratch files management for BCS Solver.

- NLimplicit: Improved convergence using multi RBE2 with the same

master node + hierarchy.

Improved error messages.

Elements - Drilling DOF in QEPH shell element.

Performances - Advanced Mass Scaling: alternative solution to standard mass scaling

to reduce elapsed time

- XFEM for cracks propagation: performance improvements (CPU cost

significantly reduced)

- Improved Starter performances, especially for huge models (several

million elements).

Documentation - Input deck examples for material laws

New Starter Keywords

- /INTER/TYPE20 – general contact for single surface, surface to

surface, node to surface treatment, including edge treatment. Zero

gap is allowed; recommended for solids.

- /MAT/LAW59 (CONNECT) – Connection material that can be used to

model spotweld, welding line, glue or to model laminate plane for

composite material.

- /MAT/LAW66 – Visco Elastic Plastic Piecewise Linear Material

- /MAT/LAW72 (HILL_MMC) – Anistropic Hill material law with a

modified Mohr fracture criteria.

- /MAT/LAW76 – Semi Analytical Model for Polymers

- /MAT/LAW82 – Hyperelastic material law (modified Ogden law)

New Engine Keywords

- /ANIM/NODA – Generates animation files containing nodal scalar

data

- /IMPL/DIVERG/n – Divergence criterion input for better time step

control.

- /IMPL/DT/3 - Implicit Time Step Control based on Riks Method

- /IMPL/DT/FIXPOINT – Fix point user input for better time step control

- /IMPL/LSEARCH/n – Line search method improves performances

(analysis w/o contacts)

- /IMPL/LSEARCH/OFF – Deactivates line search for non linear implicit

analysis

- /IMPL/PSTIF/OFF – Deactivating load (pressure) stiffness matrix.

- /IMPL/SBCS/OUTCORE – Forces BCS (Boeing solver) to use

minimum in-core memory.

- /IMPL/SBCS/MSGLV – Specifies message level for BCS (Boeing

solver)

- /IMPL/SBCS/ORDER – Reordering method for BCS (Boeing solver)

- /IMPL/SHPON – Improves the convergence of implicit nonlinear

analysis with warped shell elements (QEPH)

- /IMPL/SHPOFF – Improves implicit nonlinear analysis performances

with warped shell elements (QEPH), if rigid rotations are small

- /QEPH/V11: QEPH bug fix (otherwise fixed in v11 only).

Other Keywords

- Multidomain

Modified Starter Keywords

- /MAT/LAW42 (OGDEN) – New flag for viscosity

- /SUBMODEL – Additional keywords supported

- /TH – Updated documentation to include the improved composites

post-treatment plus additional variables for output in /TH/ACCEL

- /INISHE/ORTHO or /INISH3/ORTHO - Describes the initialization of

orthotropy direction for shells element per element.

Modified Engine Keywords

- /ANIM/VECT/CONT2 – Tied contact forces output

- /DT/Eltyp/Keyword3/Iflag – Defines the Engine input for Advanced

Mass Scaling

- /IMPL/NONLIN/N – Non linear implicit solution

Resolved Issues

Contacts - Thermics + adaptivity + dynamic condensation

- Interface TYPE2 with master curvature (Spotflag=30)

- Interface TYPE20: automatic segment edges adjustment in case of

impact with solid element.

- Interface TYPE11 + TETRA10 + /SURF/PART/EXT

- TYPE7 and TYPE11 + Inact=6: non-zero initial contact forces

Elements - Solids with 16 and 20 nodes: possible Engine error

- /PROP/SPR_BEAM: error if 3

rd node is aligned with the spring.

Airbags - LAW19 + zero stress flag + reference metrics + SPMD: initial stress

was remaining even if the zero stress flag was activated. This could

lead to premature bag unfolding (before injector activation).

- The function defined in the vent holes were not time shifted when the

flag lttf was activated.

- FVMBAG + CPB,CPC different from zero.

Output - Plastic strain output for brick20, H8C, HSEPH, PA6 (thick

shell)+smstr>0

- Tensor output for Ishell=12 and MAT25

- Temperature and density for FVM

- Stress and strain TH output for solids (composites).

Rigid wall energy output.

- Too large size of Starter output file with Ipri=0

- Incomplete TH output with SPMD + SPH

Materials and failure models - /LAW58: low initial time step (it is now computed on reference mesh

instead of initial mesh)

- /LAW59 (hexa spotwelds) + failure

- /LAW65: corrections to prevent possible core dumps in RADIOSS

Engine

SOL_ORTH + SKEW/FRAME

- /LAW70: improved stability

- /XFEM: improved stability for fracture propogation

- /LAW38 + cutoff stress + Ismstr=10

- /LAW25 + Gamma_INI, Gamma_Max (delamination values).

- /LAW51: improved stability

- /LAW2 + Eps_Max: not active for /PROP/TYPE18

- /LAW72: incorrect strain values

Kinematic conditions - /DT/NODA/AMS + RBODY with imposed velocity or displacement

- /PROP/TYPE33 (KJOINT) + functions associated to translational

stiffness and viscosity coefficients

Initial state - Tetra4R (parabolic tetra)

Implicit - BSC solver does not run if scratch area is not defined: it now has the

same I/O as RADIOSS Bulk Data format.

- Error messages improved: incompatibility with /ADMESH, etc.

- Resolved convergence issue:

with spring-back after trimming

QEPH + orthotropic laws

SPMD + /TYPE2 + Ispot=1

- NLimplicit: /RWALL + mix solver (engine error)

- Beams + large rotations: incorrect stress

- Incorrect contact force (TYPE7, 10 and 11) in Anim output.

- Improved stability on WIN7.

Stamping analysis - The memory issue related to adapted meshes used in stamping

analysis that occasionally resulted in a core dump on WinXP 32-bit

and 64-bit platforms has been resolved.

MotionSolve

New Features/Enhancements

Script Usub Support - Matlab script

- Python script

Enhanced co-simulation - Robustness and performance were enhanced.

- Co-Sim API added for RTW and 3

rd party solver co-simulation.

- Higher order (up to 2

nd order hold) co-sim were added for enhanced

security.

Enhanced command support - Almost all model elements can be used as command.

Rigidified flexible body - Flexible body can be modeled as rigid by setting rigidified=‖TRUE‖.

- Rigidified flexible body can be turned to flexible body in subsequent

analysis (but not vice versa).

Adjustable global properties

for flexible body - Mass and inertia can be adjusted for flexible body in the XML file.

- Accessible from usub via MODSET function

Improved HSTIFF/NSTIFF

solution - Robustness and performance were enhanced.

Nodal velocity/ acceleration

support in H3D

Different units in FE and MBD

models are now supported - Different units can now be specified in the OS FE and MS MBD

model.

New Force_StateEqn or

YFORCE/YFOSUB element

Speed enhancement in the

solver - Quasi-static and transient analysis performance has been enhanced.

Resolved Issues

Initial velocity solution - Initial velocity solution has been upgraded and now outputs to log file.

IF expression - The problem when IF expression executing all three branches failed

when a non-execution branch evaluated an invalid expression at that

instant has been resolved. The issue was related to a case where IF

failed when evaluating failure on LOG(0), which is part of a branch

that is not supposed to be executed based on the IF values.

Single input single output

entities - The problem that occurred when multiple Single Input Single Output

entities existed in the model has been resolved.

DAE solver statistics - The issue related to DAE solver statistics resets after solver attempts

to restart an integration has been corrected.

SYSFNC(‘JOINT’) - SYSFNC('JOINT') called from usersub yielding 2x the joint reaction

force issue has been corrected.

Comma separated values - Differences no longer exist between 32 and 64 bit solutions when a

user sub utilizes a file with comma separated values.

Co-simulation - Co-simulation with MotionSolve has been significantly enhanced.

Improved IV solution - In a few cases, previous IV solution can produce spurious results. This

has been fixed.

- VM/WM support for models in ADM format is now available.

SYSFNC(‘FORCE’) called from

CONSUB or REQSUB without

- This was giving incorrect results and has been fixed.

iflag=1

RSPDP deactivate issue - Deactivate is not deactivate before since the action was not

deactivated.

PITCH angle sign issue fixed

Writing and translating large

files - There was a crash issue when writing huge MRF files (over 2 GB) and

translating to ABF and PLT files. This has been fixed.

OptiStruct

Altair OptiStruct is a finite element and multi-body dynamics software that can be used to design and optimize structures

and mechanical systems. OptiStruct uses the analysis capabilities of RADIOSS and MotionSolve to compute responses

for optimization.

Enhancements

Constraint screenings - When buckling responses are considered in an optimization problem, the

default for DOPTPRM, MAX_BUCK is now set at 15; a warning is issued

when DOPTPRM, MAX_BUCK is less than 15.

- When buckling responses are considered in an optimization problem, a

warning is issued when GBUCK is not defined and auto constraint screening

is active.

Design variable references

supported for MAT4 and MAT5 - Thermal materials MAT4 and MAT5 may now be referenced on DVMREL#

cards.

Resolved Issues

PSHELL material Optimization - MID1 is allowed to be not designed while MID2, MID3, and MID4 are.

Maximum Constraint Violation - Composite manufacturing constraints are now included for sizing

optimization.

Ply-based composite material

definition - For laminates of more than 9 plies, ply orientations are now correctly

identified as ply thicknesses by all output routines. Improper printing and

crashes when using OUTPUT, SZTOSH no longer occur.

- The mechanism used to detect designable properties whose values changed

during an optimization no longer fails for negative values (noticeably negative

orientations). The output of updated properties to the .prop file is no longer

affected.

- EXCLUDE option now works for elements referencing ply-based composite

material definitions.

Sensitivities - Minor correction made in the calculation of pressure sensitivities with direct

method.

- Corrected sizing sensitvity for thermal loading.

- Corrected gravity and centrifugal loading sensitivities on CBARs with pin

flags.

Material Sizing - Corrected behavior of DVMREL

DOPTPRM,SHAPEOPT,2 - Corrected behavior, related to alternative shape optimization algorithm, that

was, in some instances, causing the software to crash.

DLINK2 - Corrected behavior, related to DLINK2, that was causing the software to

crash on HP-UX ia64 platform.

HyperXtrude

New Features and Enhancements

Metal Extrusion

Bearing friction model - Updates to the bearing friction model to improve friction behavior at the die—

bearing region based on extrusion data of twenty five different profiles.

Flow stress plots - The H3D result file exported by the solver includes the flow stress data.

Loads on tool surfaces - It is no longer required to include a tool mesh in the analysis to get the loads

on the workpiece—tool interface for purpose of doing stress analysis using

RADIOSS. Even for models with just workpiece, HX will now export the

pressure loads on the workpiece—tool boundary faces. This file can be used

to map the loads on the tool mesh in the HyperXtrude user profile and to do

tool stress analysis using RADIOSS.

Strain computation - Modifications to strain computation to account for dead metal zone to

eliminate spurious high values in this region.

Viscoplastic friction model - Changes to the viscoplastic friction model improve the accuracy.

Bearing profile - Improvements to bearing profile friction computations improve the accuracy

of stick/slip behavior.

Weld strength - Exported H3D results file will include ―weld strength‖. The HyperXtrude solver

compares the pressure and flow stress data to predict this measure.

Nose cone prediction - Profile deformation analysis predicts the nose cone under steady state

analysis. However, the standard free surface analysis will be performed for

the transient analysis.

Improvements to temperature

prediction - Changes were implemented to avoid excessive heating due to stress work in

the bearing and profile region.

Files for automatic report

generation - The HyperXtrude solver automatically writes a file (*.rpt), which is used by

the HyperXtrude user profile for report generation.

Polymer Processing

Roller surface BC - A new boundary condition to model the extruded profile moving on a roller

surface moving/rotating at a specified speed has been introduced.

Viscosity plots - The H3D result file exported by the solver now includes the viscosity data.

Residence time - Results computed now include residence time.

Viscoelastic model - Criminale-Ericksen-Filbey model, which uses first and second normal stress

coefficients to consider effects of viscoelasticity, has been implemented. This

model is well suited for polymer extrusion.

General

Pressure prediction - A pressure smoothing step has been added to improve the quality of

pressure prediction in models made of non-hexahedral meshes.

Resolved Issues

Numerical instability - Numerical instability in solving the energy equation in advection dominated

flows is now removed.

Unit conversion error - Unit conversion error in the force balance table has been fixed.