I cannot seem to get rotary inertia to work for ANSYS LS-DYNA MASS166 elements. Why?
This is a known error and has been fixed in ANSYS LS-DYNA 12.0, per Defect 58795. A new test case (dyna-329s.dat) has been added to the QA Test Set. The input and output (both 11.0, which fails and 12.0, which runs) files have been attached to this record. The ANSYS LS-DYNA 12.0 results match those from VM47.dat, which is part of the ANSYS implicit Verification Manual. Finally, the MASS166 documentation has been altered to note the following: MASS166 Real Constants If KEYOPT(1) = 0: MASS - Concentrated mass (Force*Time2/Length) (must be > 0) If KEYOPT(1) = 1: IXX - Moment of inertia (must be > 0), IXY - Moment of inertia, IXZ - Moment of inertia, IYY - Moment of inertia (must be > 0), IYZ - Moment of inertia, IZZ - Moment of inertia (must be > 0) . |
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