ABAQUS/Standard UMAT Example Problem (Non-FEAMAC ...
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ABAQUS/Standard UMAT Example Problem (Non-FEAMAC ...
10. ABAQUS/Standard UMAT Example Problem (Non-FEAMAC). Description:
This is an example problem from Section 1.1.1 of the ABAQUS Example Problem
...
ABAQUS/Standard UMAT Example Problem (Non-FEAMAC) Description: This is an example problem from Section 1.1.1 of the ABAQUS Example Problem Manual [1]. It is an analysis of a bolted pipe flange and gasket connection using a 3D model. The purpose of this example problem is for the FEAMAC user to ensure that their ABAQUS/Standard installation is working properly in the case of a user-defined constitutive model (UMAT) for a material. The gasket material is modeled as an isotropic material via a UMAT. A clamping force of 15 kN is applied to the bolt using the *PRETENSION SECTION option to associate a pre-tension node with a pre-tension section, where the pretension section is identified by means of the *SURFACE option. The pre-tension is then prescribed by applying a concentrated load to the pre-tension node. The applied load is 7.5 kN since only half of a bolt is modeled in conjunction with symmetry conditions [1]. Required Files: The following files should be placed in the ABAQUS working directory: File boltpipeflange_3d_usr_umat.inp boltpipeflange_3d_usr_umat.for
Purpose ABAQUS input file User-defined subroutine UMAT describing gasket material constitutive model
Execution: This problem can be executed via the following command at the ABAQUS command line: abaqus –j boltpipeflange_3d_usr_umat –user boltpipeflange_3d_usr_umat interactive
The –j specification indicates the job name (i.e., ABAQUS input file name), while the –user specification indicates the file containing the appropriate UMAT routine for the given problem. The interactive specification provides detailed information on the problem execution during the execution and is optional. Output: The output for this problem is written to the ABAQUS output database file boltpipeflange_3d_ usr_umat.odb for post-processing in ABAQUS/CAE, ABAQUS/Viewer, or other appropriate finite element post-processing software. In addition, ASCII output is written to the boltpipeflange_3d_ usr_umat.dat file. Results: Results in the form of the Von Mises stress field in the bolted pipe flange connection are given in Fig. 1.
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Fig. 1. von Mises stress field (MPa) in the bolted pipe flange connection modeled in the ABAQUS example problem 1.1.1 [1].
