My SOLID168 (10-node tet) model gets corrupted and the elements appear to be missing some nodes. Is this a known error?

You are most likely hitting Defect 37642, which occurs in ANSYS LS-DYNA for both versions 9.0 and 10.0. The error is that LS-DYNA drops the last two nodes from the 10-node tet element definitions, causing an element plot to look as if some tet faces have been removed. It has been corrected in the UP20050817 build of 11.0.

This SOLID168 element definition error occurs when LS-DYNA itself writes the headers to the .RST and .HIS files, which occurs when there are no .RST and .HIS file headers (written by ANSYS LS-DYNA) available. This situation can be due to having only a .K file to submit to the LS-DYNA solver (as opposed to having creating the model in ANSYS LS-DYNA, which writes the results file headers when the EDWRITE command is issued). This can also occur when the absolute path name is included in the input file name when the .K file is submitted to the LS-DYNA solver (either by the command line or via the Launcher). This latter error (Defect 37641) is also fixed in ANSYS 11.0 UP20050817 and is explained in more detail in KB Solution 293400.

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