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Andrey-Fog / ANSYS-USERMAT-CMSG

The conventional theory of mechanism-based strain gradient plasticity is realized via ANSYS user programmable features for USERMAT subroutine. APDL script with example of cracked plate and instructions for compiling you can find in source files.
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question about the code of 'xjacm array structure' in usermat3d.f . #4

Closed Budong-zhangliang closed 2 months ago

Budong-zhangliang commented 2 months ago

In the source code (line 299- line 347) of usermat3d.f, the Jacobian matrix 'xjacm' line and column are mixed. xjacm=matmul(deriv(38), coord(83)).

For example, xjacm(1,2) should be xjacm(2,1) xjacm(1,2)= deriv(2,1)SVAR(1,1)+deriv(2,2)SVAR(2,1) 1 +deriv(2,3)SVAR(3,1)+deriv(2,4)SVAR(4,1) 2 +deriv(2,5)SVAR(5,1)+deriv(2,6)SVAR(6,1) 3 +deriv(2,7)SVAR(7,1)+deriv(2,8)SVAR(8,1)

If possible, please check it. Many thanks.

Andrey-Fog commented 2 months ago

Yes, in this part line and column are mixed. I'm think source code is correct for my structure of arrays. I will check it for sure later.

Andrey-Fog commented 2 months ago

Fixed. Thank you.

Budong-zhangliang commented 2 months ago

Many thanks!However,xjacm(1,2) and xjacm(2,1) are fixed, while xjacm(1,3) and xjacm(3,1), xjacm(2,3) and xjacm(3,2) are not fixed.