Mechanical APDL Basic Analysis Guide - Ansys
Mechanical APDL Basic Analysis Guide - Ansys Mechanical APDL Basic Analysis Guide - Ansys
Chapter 4: Initial State ! Apply a Strain of EPEL X=0.01 at Elem Integration Pt 3 within Element 2. ! Here it is assumed that the initial stress is zero. inis,set,dtyp,eppl inis,defi,2,3,,,0.01 ! Apply accumulated equivalent plastic strain. inis,set,dtyp,pleq inis,defi,2,3,,,0.02 ! 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,dtype,eppl inis,set,mat,1 inis,defi,,,,,2.0 inis,set,mat,2 inis,defi,,,,,0.2 For an initial plastic strain example problem, see Example: Initial Plastic Strain Problem Using the INISTATE Command (p. 94). 4.4. Initial State File Format Although you can use the INISTATE command repeatedly to assign explicit values to various items, creating an external file simplifies the process. You can create a standalone initial state file to be read into your analysis via an INISTATE,READ command. The file format must be comma-delimited ASCII, consisting of individual rows for each stress item. Each of the rows consists of columns separated by commas. Your columns delineate the integration point(s) for the specific elements. See Integration Point Locations in the Theory Reference for the Mechanical APDL and Mechanical Applications for more information about the number and location of available element integration points. Also see "Element Library" in the Theory Reference for the Mechanical APDL and Mechanical Applications for a listing of the integration points for each specific element. The number of section integration points for beams and cells is dependent upon the associated user input. One element ID number can be repeated on successive lines to specify different stresses at different integration points. Each line of the initial stress file has 10 columns, as follows: • The element ID Number • The element integration point (for standard elements) • The layer (for layered elements) or the cell number (for beams) • The section integration point (for beams and shells only) • The six stress/strain components Any of the parameters for element ID, element integration point, layer number, cell number, or section integration point can be set to ALL. For example, 1,all,all,all, 100, 0, 0, 0, 0, 0 applies an equal stress of SX = 100 to all integration points or layers of the element ID = 1. This input line 90 all,all,all,all, 100, 0, 0, 0, 0, 0 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
applies an equal stress of SX = 100 to all integration points or layers to all of the selected elements. You can provide additional parameters via the /ATTR,VALUE line in the .IST file. Supported parameters are CSYS and DTYP. Issue a CSYS,VALUE command to specify the coordinate system to be used for the subsequent data supplied in your .IST file. The default coordinate system is the global Cartesian system. You can apply initial strain in a similar manner by including /DTYP,EPEL before the actual initial-state/initialstrain date. For example, /dtyp,epel all,all,all,all, 0.1, 0, 0, 0, 0, 0 applies an initial strain of ex = 0.1 for all elements in the database. You can insert comments and other non-analysis information in the .IST file by preceding them with an exclamation mark (!). 4.5. Using Coordinate Systems with Initial State The INISTATE command provides options for specifying data in coordinate systems other than the material and element coordinate systems. To define the coordinate system, issue this command: INISTATE,SET,CSYS,CSID Valid values for CSID are MAT (material) or ELEM (element), or any user-created coordinate system. Shell elements support only material and element coordinate systems. Link elements support only element coordinate systems. The default coordinate systems are 0 (global Cartesian) for solid elements, and ELEM for shell, beam and link elements. 4.6. Initial State Limitations The following limitations initial state limitations apply: • Available for current-technology elements only. • Not supported for use with kinematic hardening material properties. 4.7. Example Problems Using Initial State This section provides examples of typical initial state problems, as follows: 4.7.1. Example: Initial Stress Problem Using the IST File 4.7.2. Example: Initial Stress Problem Using the INISTATE Command 4.7.3. Example: Initial Strain Problem Using the INISTATE Command 4.7.4. Example: Initial Plastic Strain Problem Using the INISTATE Command 4.7.1. Example: Initial Stress Problem Using the IST File 4.7.1. Example: Initial Stress Problem Using the IST File The following example initial stress problem shows how to define an initial stress file and use the INISTATE,READ command to read the data into your analysis. The following file contains the initial stresses to be read into ANSYS. Each element has eight integration points in the domain of the element. Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 91
- Page 55 and 56: the shell, and 270° to 360° for t
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applies an equal stress of SX = 100 to all integration points or layers to all of the selected elements.<br />
You can provide additional parameters via the /ATTR,VALUE line in the .IST file. Supported parameters<br />
are CSYS and DTYP. Issue a CSYS,VALUE command to specify the coordinate system to be used for the<br />
subsequent data supplied in your .IST file. The default coordinate system is the global Cartesian system.<br />
You can apply initial strain in a similar manner by including /DTYP,EPEL before the actual initial-state/initialstrain<br />
date. For example,<br />
/dtyp,epel<br />
all,all,all,all, 0.1, 0, 0, 0, 0, 0<br />
applies an initial strain of ex = 0.1 for all elements in the database.<br />
You can insert comments and other non-analysis information in the .IST file by preceding them with an<br />
exclamation mark (!).<br />
4.5. Using Coordinate Systems with Initial State<br />
The INISTATE command provides options for specifying data in coordinate systems other than the material<br />
and element coordinate systems. To define the coordinate system, issue this command:<br />
INISTATE,SET,CSYS,CSID<br />
Valid values for CSID are MAT (material) or ELEM (element), or any user-created coordinate system.<br />
Shell elements support only material and element coordinate systems. Link elements support only element<br />
coordinate systems.<br />
The default coordinate systems are 0 (global Cartesian) for solid elements, and ELEM for shell, beam and<br />
link elements.<br />
4.6. Initial State Limitations<br />
The following limitations initial state limitations apply:<br />
• Available for current-technology elements only.<br />
• Not supported for use with kinematic hardening material properties.<br />
4.7. Example Problems Using Initial State<br />
This section provides examples of typical initial state problems, as follows:<br />
4.7.1. Example: Initial Stress Problem Using the IST File<br />
4.7.2. Example: Initial Stress Problem Using the INISTATE Command<br />
4.7.3. Example: Initial Strain Problem Using the INISTATE Command<br />
4.7.4. Example: Initial Plastic Strain Problem Using the INISTATE Command<br />
4.7.1. Example: Initial Stress Problem Using the IST File<br />
4.7.1. Example: Initial Stress Problem Using the IST File<br />
The following example initial stress problem shows how to define an initial stress file and use the<br />
INISTATE,READ command to read the data into your analysis.<br />
The following file contains the initial stresses to be read into ANSYS. Each element has eight integration<br />
points in the domain of the element.<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 />
91
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