Contact problem in NLGEOM and NLSTAT cases
Altair EmployeeHi,
I am using OptiStruct 14.0 to model 3D Four-point-bending test of L-shaped structure, two rigid loading cylinders and two rigid supporters have been created. I tried to use two different ways: 1) NLGEOM (geom non-linear impl static) 2) NLSTAT (non-linear quasi-static). However, the contact didn’t work well in these two cases, so please check the attached models and give me any suggestions.
Thank you in advance.
Answers
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Hi, Mr. Prakash Pagadala,
I tried the model you attached. Fortunately, the results I got is similar with yours, However, the following information could be seen:
*** ERROR # 4079 ***
Non-convergent nonlinear iterations for subcase 1.
ANALYSIS COMPLETED.
*** SOME ERRORS WERE REPORTED DURING THE RUN,
*** PLEASE VERIFY RESULTS AS THEY MAY BE INVALID.Do you know why does the error happen because I used your model?
Besides, about NLSTAT model I attached above, could you also please check it?
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Hi, Mr. Prakash Pagadala,
I tried the model you attached. It can be convergent now. However, considering the further optimization work, NLSTAT is better since NLGEOM is time-consuming and convergence difficulties.
About NLSTAT attached model, the contact between L-shaped structure and supporters cannot work well. Could you please check it?
Thank you in advance!
<?xml version="1.0" encoding="UTF-8"?>
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I am already working on it. I think the problem is with the cotact stiffness. Meanwhile please proceed with NLGEOM. I will update when I have some valid results.
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