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  1. This document well answered how the mat coordinate system defined and how the mat coordinate system rotates.
  2. Hey, guys. I find this document very helpful for this question. I attached it here. Thank you. orthotropic-materials-draft-mrj.pdf
  3. Hello, everyone. Recently I am very confused by the material angle defined by B1, B2, B3 in *section_shell and by AOPT in material model card. For example, in my research case, there are three through thickness integration points that represent three different fiber tows (t1, t2, t3). The three fiber tows have different constituents equations and different material angles (+60/0/-60). A right represent is shown in figure 1 (a). Then I defined their AOPT respectively shown in Figure 2. Figure 1 Figure 2 Then if I also make icomp=1 and give 60/0/-60for B1, B2 and B3 as shown in Figure 3, then what's the relation between figure 2 and figure 3. I don't know if this is right? I am worried about whether the material angle is right. Because it will influence the results a lot. Figure 3 Thank you for your patience. We can discuss here. I am eagle to hear your advice. Thanks.
  4. Thank you for your kind help. This problem is solved. I am so happy. Best wishes for you.
  5. Hi, thank you for reviewing this topic. Have you ever lost some buttons in the panel m of Hypermesh. The Geom, 1D, 2D, 3D, Analysis......And there is no "return" button. That is so weird. Does anyone know how to make them show again? Thanks a lot.
  6. Thanks for your help. I can create new element use the edit element panel. But the next analysis will still have the error with another element. I am really confused. I want to find out every element with this problem and correct them all.
  7. I think it works. the yield point is the beginning of plastic process. the load curve should start with a plastic strain=0 and a plastic stress=yield stress. Of course you should make a transfer to the effective stress and effective plastic strain.
  8. Hi, everyone Thanks for reading this topic. When I submitted a job, I got the error information: *** Error 20222 (STR +222) in solid element connectivity, element 103338 the first 4 nodes must be unique. Then I find this element 103338 and check element, there is no problem with its connectivity and duplicates (see the bellowing picture). It is very confusing. If I delete this element and translate + duplicate an adjacent one and then equivalence nodes, the error will still exist, but in another different element. I don't how many elements has this problem. I also tried renumber all, but it is still useless. I really want to have your suggestions if you are familiar with it. Thanks a lot.
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