Writing UEL UMAT for FEA: Matlab to Fortran Conversion
Learn how to convert a complete FEA Matlab code to Fortran for implementing UEL UMAT. Explore subroutines, their conversion in Abaqus, and material assumptions for a unit brick problem. Understand boundary conditions and nodal forces for isotropic materials. Compare Matlab code output with a reference solution of Lame constants. Gain insights into translating Matlab code to Fortran for Abaqus implementation and discuss the results.
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Presentation Transcript
How to write UEL(UMAT) from a complete FEA Matlab code 1. Understande what is a subroutine 2. The conversation of subroutine in Abaqus 3. From complete Matlab code to Fortran code. 2025/4/23 2
Unit brick Problem description Material: Assume an isotropic material with the two Lame s constants of =110.7 GPa and ?=80.2 GPa. Boundary conditions: A nodal force of 10 kN is applied at the four nodes on the top, while the bottom four nodes are fixed in such a way that the uniaxial tension condition can be met, that is, ???=???= ???=???= ???= ???= ???. 2025/4/23 3
Matlab code Output 2025/4/23 4
Reference solution =110.7 GPa and ?= GPa 2025/4/23 5
Results and discussion 1. The result of matlab code is the same as that of Abaqus CAE 2. Learn the matlab code to understand Fortran code for Abaqus 3. Up to now, this is the end. 2025/4/23 6
