Section 19 - Bolt Modeling

8/10/2019 Section 19 - Bolt Modeling

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Copyright 2010 Altair Engineering, Inc. All rights reserved.Altair Proprietary and Confidential Information

Bolt Modeling workbench

Application | Special | Bolt Modeling


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Bolt-Head

Bolt Modeling | Bolt-Head A bolt is modeled as 2 parts, the head and the tail. The head portion

can be modeled in one of several ways. Most common type is top

and bottom RBE connected by a bar element

T o p R E

o t t o m R E

a r

T o p R E

a r

o t t o m R E

a r

T o p R E

o t t o m R E

a r

Mid R E

a r


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Edge Based Bolt-Head (Ex:Cover.gda)

To create the head part of the bolt hole, the bolt holes are identifiedby manually by selecting the single edge on top and bottom of the

holes. Multiple bolts can also be created by selecting top and bottom

edges for each bolt hole


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Edge Based Bolt-Head (Contd.)


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It is possible that a model can have a lot of bolts and it makes itdifficult to manually pick all the edges. So the another option is

provided to model bolt heads on all the hoes on a face. User need to

select the face(s) where bolt head sits and specify the bolt hole

diameter range.

Face Based Bolt-Head (Ex:Cover.gda)


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Face Based Bolt-Head (Contd.)


7/34Copyright 2010 Altair Engineering, Inc. All rights reserved.Altair Proprietary and Confidential Information

Bolt-Thread

Bolt Modeling | Bolt-Thread The thread portion of the bolt can be modeled in one of several ways

o t t o m R E

T o p R E

o t t o m R E

a r

o t t o m R E

a r

T o p R E



Configuration of bottom RBE

Down Up

Both

Sections

D o w n

S e c t I o n s



To create the thread part of the bolt hole, the bolt holes are identifiedby manually selecting the single edge on top of the holes. Multiple

bolts can also be created by selecting top edges for each bolt hole

Edge Based Bolt-Thread (Ex:Carrier.gda)



Edge Based Bolt-Thread (Contd.)



User need to select the face(s) and specify the bolt hole diameterrange.

Face Based Bolt-Thread (Ex:Carrier.gda)



File based bolt modeling (Ex: Diff_Case.gda)

Bolt Modeling | Import Bolt Bolts can also be modeled by directly importing the bolt definition

file. Importing bolt will create both head and thread portion of bolts.

There are three different blocks in the file called BOLT, HEAD_DEF

and THREAD_DEF define bolt, head and thread respectively. The

complete definition for each key work of the bolt definition file isavailable in F1 help.

Sample bolt definition file (BoltDefinition.dat).
http://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dathttp://localhost/var/www/apps/conversion/tmp/scratch_7//testsystem/FTP_Dont_Delete/Training_Material/SimLab%209.0_Presentation_NewUpdate_Jan04_2011/BoltDefinition.dat



Bar Pretension

Bolt Modeling | Bar Pretension User can model the pre tension in the tightened bolt in several ways.

The tension in the tightened bolt is modeled by creating RBEs, Bars

and force by selecting the edges on bolt hole. This option is refered

as EdgeBased.

Different types of Bar Pretension are

Through

Threaded



Through / Threaded (Edge Based)

T o p R E

o t t o m R E

a r

F o r c e

T o p R E

o t t o m R E

a r

F o r c e

T o p R E

o t t o m R E

a r

F o r c e

T o p R E

o t t o m R E

a r

F o r c e

a r

T o p R E

o t t o m R E

F o r c e



Through (Ex: BarPretension.gda)

This type can be modeled by selecting the top edge of bolt shankhole and bottom edge of threaded hole



Through (Contd.)



Threaded (Ex: BarPretension.gda)



RBE Based (Ex:RBEBased_BarPretension.gda)

Bar pretension can also be modeled by directly selecting theRBEs/Nodes referred as RBE Based and Node Based

respectively.


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Solid Pretension

Bolt Modeling | Solid Pretension User can model the pre tension in the tightened bolt by applying

solid pretension for the following solver

Abaqus

Ansys

Nastran

Permas

There are two ways of creating Abaqus bolt

Creating pretension face

Using existing pretension face


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Abaqus Creating pretension cut

Ex: Bolt.gda Define the plane where to create the pretension cut.


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Ex: Bolt_With_Cut.gda Select the pretension cut face in the bolt

Abaqus Using existing pretension cut


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Ansys, Nastran, Permas solid pretension

There are three ways of creating Ansys, Nastran and Permas bolt

1. Creating pretension cut

2. Using existing pretension cut

3. Using the faces apart in the bolt

1. Creating pretension cut (Ex: Bolt.gda)

User need to define the plane to create pretension cut and solidpretension based on solver

2. Using existing pretension cut (Ex: Bolt_With_Cut.gda)

User need to select the existing pretension cut to create solidpretension based on solver

3. Using the faces apart in the bolt (Ex: Bolt_With_Face_Apart.gda)

User need to select the two face apart in the bolt to create solidpretension based on solver


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Bolt.gda, Bolt_With_Cut.gda, Bolt_With_Face_Apart.gda


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Solid Bolt

Bolt Modeling | Create Bolt User need to define the axis and pivot point followed by the

parameters

Templates can be exported/imported


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Connection

Bolt Modeling | Connection Creates connection between bodies automatically

Rigid Bar

Equivalence

RBE


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Rigid Bar (Ex: Connection.gda)

Bolt Modeling | Connection | RBAR User can select either the option between two bodies two bodies

(Rigid body/Bar body) or all bodies to connect the free nodes by

RBAR by identifying the matching nodes based on the tolerance

value specified.


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Rigid Bar (Contd.)

RBAR


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Bolt Modeling | Connection | Equivalence RBE center nodes and bar body free nodes, which lie within the

given tolerance will get equivalence.

Equivalence (Ex: Connection.gda)


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Equivalence (Contd.)

Node equivalence


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RBE (Ex: Connection.gda)

Bolt Modeling | Connection | RBE User need to select dependent and independent body, based on the

tolerance specified the matching nodes will be connected by a RBE


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Documents

Section 19 - Bolt Modeling