March 17, 2023 at 9:00 amFAQParticipant
â€œIsochronousâ€ in this context refers to curves of stress vs strain at different times in the relaxation history. The use of Isochronous stress-strain curves offers a conservative and simplified alternative to performing a full blown rate dependent creep analysis. The general recommendation is that if user already has a series of creep vs relaxation time data for different stress values and he can get a good curve fit with one of our standard creep material options, there is no need to convert this data into isochronous curves of stress vs strain . We cannot represent creep behavior directly in ANSYS from Isochronous stress-strain curves at different times. The use of these isochronous curves in a more conservative rate independent analysis might have some merit when the above recommendation is not possible, but it is an engineering judgment on the userâ€™s part as to the validity of this approach. Refer also to ASME PV&P Div Conference paper PVP2011-57130, Isochronous Stress/Strain Curves-Origins, Scope and Appllication by Douglas Marriott July 17,2011.
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