Stress-strain curve API 579 FFS-Level III
Stress-strain curve API 579 FFS-Level III
(OP)
Hi everyone!
I have doubt about Tangent Modulus (Etan) calculation for FEM elasto-plastic anaysis using equation F.22 (Annex F, MPC model) in API 579. In the Bilinear elasto-plastic with isotropic hardening model a constant Etan is needed, but Etan calculation from F-22 depends on the level of strain (it is not constant), which value must be taked?
Thanks!
Jack
I have doubt about Tangent Modulus (Etan) calculation for FEM elasto-plastic anaysis using equation F.22 (Annex F, MPC model) in API 579. In the Bilinear elasto-plastic with isotropic hardening model a constant Etan is needed, but Etan calculation from F-22 depends on the level of strain (it is not constant), which value must be taked?
Thanks!
Jack





RE: Stress-strain curve API 579 FFS-Level III
The tangent modulus calculation in equation F.22 is just calculating the first derivative of the stress-strain curve.
RE: Stress-strain curve API 579 FFS-Level III
Thanks a lot!
Jack