Hydrostatic pressure for Hyper74 is different from that for Plane183. (Both models use the same neo-Hookean hyperelastic material model, identical mesh, and identical loading.) Other results such as SEQV compare well, however. Why is HPRES different?
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The HPRES values reported for Plane183 are approximately equal in magnitude but opposite in sign to those reported for Hyper74. This difference is due to the use of a different sign convention for HPRES in the 18x elements. Please see the 8.0 Theory manual, Eq. 3-96 (the notes following this equation document the convention used for 18x elements). This convention is also noted in the 8.0 Advanced Structural Nonlinearities seminar, on slide 6-95. |
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