Mechanical APDL Basic Analysis Guide - Ansys
Mechanical APDL Basic Analysis Guide - Ansys Mechanical APDL Basic Analysis Guide - Ansys
Chapter 4: Initial State 4.2. Initial State Element Support The initial state capability is available only for current-technology elements. (Initial state support is not available for legacy elements.) The INISTATE initial state command supports the following elements: LINK180 SHELL181 PLANE182 PLANE183 SOLID185 SOLID186 SOLID187 BEAM188 BEAM189 SOLSH190 SHELL208 SHELL209 REINF264 REINF265 SHELL281 SOLID285 For more information about current and legacy element technologies, see Legacy vs. Current Element Technologies in the Element Reference. 4.3. Initial State Application This section provides typical cases for applying an initial state, as follows: 4.3.1. Initial Stress Application 4.3.2. Initial Strain Application 4.3.3. Initial Plastic Strain Application 4.3.1. Initial Stress Application Although initial stress is element-based, the structure of the INISTATE command is element-type-independent. For continuum or link elements, apply initial stress according to the specific element integration point. For layered elements, apply initial stress based on the layer number, the layer integration point or the element integration point. Beams allow you to apply initial stress based on the cell number, the section integration point, and/or the element integration point. For reinforced elements, you can assign different values of initial stress to different reinforcings within the same element. The following example listing shows how initial stress can be applied in such cases: Constant Initial Stress on the Whole Model inis,defi,,,,,100,200,300,400,500,600 Apply Constant Stress of SX=100 On Beam Element 1 inis,defi,1,,,,100 Apply a Stress of SX=33.333 at Elem Integration Pt 3 within Element 2 inis,defi,2,3,,,33.3333 Apply Constant Stress Of SX=200 in Cell 2 For All Selected Beam Elements inis,defi,,,2,,200 Apply Constant Stress Of SX=200 For All Beams In A Model And Wherever There Is Material=3 inis,set,mat,3 inis,defi,,,,,200 Apply a Stress of SX=100,SY=200,SXY=150 for Layers 1,3,5 and SX=200,SY=0 for Layers 2,4,6 in a Layered Shell Element. Layer 1,3,5 have material 1 and Layer 2,4,6 have material 2. 88 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
inis,defi,,,1,,100,200,150 inis,defi,,,2,,200 inis,defi,,,3,,100,200,150 inis,defi,,,4,,200 inis,defi,,,5,,100,200,150 inis,defi,,,6,,200 OR inis,set,mat,1 inis,defi,,,,,100,200,150 inis,set,mat,2 inis,defi,,,,,200 Apply a Stress of SX=33.333 at Reinf 1 for all elements inis,defi,,,1,,33.3333 For initial stress example problems, see Example: Initial Stress Problem Using the IST File (p. 91) and Example: Initial Stress Problem Using the INISTATE Command (p. 93). 4.3.2. Initial Strain Application The initial stress application example can be extended for initial strain by simply changing the data type to EPEL, as shown: ! Constant Initial Strain on the Whole Model inis,set,dtyp,epel inis,defi,,,,,0.1,-0.01,-0.01 !Apply a Constant Strain of EPEL X=0.01 On Beam Element 1 inis,set,dtyp,epel inis,defi,1,,,,0.01 !Apply a Strain of EPEL X=0.01 at Elem Integration Pt 3 within Element 2 inis,set,dtyp,epel inis,defi,2,3,,,0.01 !Apply a Constant Strain Of EPEL X = 1E-6 in Cell 2 For All Selected Beam Elements inis,set,dtyp,epel inis,defi,,,2,,1E-6 !Apply a Constant Strain Of EPEL X=1E-3 For All Beams In A Model !And Wherever There Is Material=3 inis,set,dtyp,epel inis,set,mat,3 inis,defi,,,,,1E-3 ! Apply EPS X = 0.1, EPS Y = -0.02, EPS Z = -0.02, for Layers 1,3,5 and ! EPS X = 0.2, for Layers 2,4,6 ! Layer 1,3,5 have material 1 and Layer 2,4,6 have material 2. inis,set,mat,1 inis,defi,,,,,0.1,-0.02,-0.02 inis,set,mat,2 inis,defi,,,,,0.2 For an initial strain example problem, see Example: Initial Strain Problem Using the INISTATE Command (p. 93). 4.3.3. Initial Plastic Strain Application The initial stress application example can be extended for initial plastic strain by simply changing the data type to EPPL, as shown: ! Constant Initial Plastic Strain and Stress on the Whole Model inis,set,dtyp,eppl inis,defi,,,,,0.1 inis,set,dtype,s inis,defi,,,,,1000 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 4.3.3. Initial Plastic Strain Application 89
- Page 53 and 54: Figure 2.9 Example of Surface Load
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- Page 77 and 78: Command GUI Menu Paths Main Menu> S
- Page 79 and 80: ! Load Step 1: D, ... ! Loads SF, .
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- Page 87 and 88: 11. Select Utility Menu> PlotCtrls>
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- Page 103: Chapter 4: Initial State The term i
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inis,defi,,,1,,100,200,150<br />
inis,defi,,,2,,200<br />
inis,defi,,,3,,100,200,150<br />
inis,defi,,,4,,200<br />
inis,defi,,,5,,100,200,150<br />
inis,defi,,,6,,200<br />
OR<br />
inis,set,mat,1<br />
inis,defi,,,,,100,200,150<br />
inis,set,mat,2<br />
inis,defi,,,,,200<br />
Apply a Stress of SX=33.333 at Reinf 1 for all elements<br />
inis,defi,,,1,,33.3333<br />
For initial stress example problems, see Example: Initial Stress Problem Using the IST File (p. 91) and Example:<br />
Initial Stress Problem Using the INISTATE Command (p. 93).<br />
4.3.2. Initial Strain Application<br />
The initial stress application example can be extended for initial strain by simply changing the data type to<br />
EPEL, as shown:<br />
! Constant Initial Strain on the Whole Model<br />
inis,set,dtyp,epel<br />
inis,defi,,,,,0.1,-0.01,-0.01<br />
!Apply a Constant Strain of EPEL X=0.01 On Beam Element 1<br />
inis,set,dtyp,epel<br />
inis,defi,1,,,,0.01<br />
!Apply a Strain of EPEL X=0.01 at Elem Integration Pt 3 within Element 2<br />
inis,set,dtyp,epel<br />
inis,defi,2,3,,,0.01<br />
!Apply a Constant Strain Of EPEL X = 1E-6 in Cell 2 For All Selected Beam Elements<br />
inis,set,dtyp,epel<br />
inis,defi,,,2,,1E-6<br />
!Apply a Constant Strain Of EPEL X=1E-3 For All Beams In A Model<br />
!And Wherever There Is Material=3<br />
inis,set,dtyp,epel<br />
inis,set,mat,3<br />
inis,defi,,,,,1E-3<br />
! Apply EPS X = 0.1, EPS Y = -0.02, EPS Z = -0.02, for Layers 1,3,5 and<br />
! EPS X = 0.2, for Layers 2,4,6<br />
! Layer 1,3,5 have material 1 and Layer 2,4,6 have material 2.<br />
inis,set,mat,1<br />
inis,defi,,,,,0.1,-0.02,-0.02<br />
inis,set,mat,2<br />
inis,defi,,,,,0.2<br />
For an initial strain example problem, see Example: Initial Strain Problem Using the INISTATE Command (p. 93).<br />
4.3.3. Initial Plastic Strain Application<br />
The initial stress application example can be extended for initial plastic strain by simply changing the data<br />
type to EPPL, as shown:<br />
! Constant Initial Plastic Strain and Stress on the Whole Model<br />
inis,set,dtyp,eppl<br />
inis,defi,,,,,0.1<br />
inis,set,dtype,s<br />
inis,defi,,,,,1000<br />
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information<br />
of ANSYS, Inc. and its subsidiaries and affiliates.<br />
4.3.3. Initial Plastic Strain Application<br />
89
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