Should LCOPER,LPRIN be used to obtain SEQV for PIPE16 after a load case
combination, the results in ANSYS 10.0 do not appear to be correct.

The VonMises stress (SEQV) for PIPE16 after issuing LCOPER,LPRIN
is incorrect in ANSYS 10.0. A class 3 error report will be issued [REF: Defect 39817.]
PIPE20, a plastic version of PIPE16 doesn't have this error, so it could
be used instead. For PIPE20, SEQV is computed in the usual way from the
combined component stresses.

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