PSI - Issue 14

Bimal Das et al. / Procedia Structural Integrity 14 (2019) 619–626 Das et al./ Structural Integrity Procedia 00 (2018) 000 – 000

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behavior of P91 steel considering Ohno-Wang cyclic plasticity material model. The conclusions drawn from the experiments and simulation are:  A reduction in life is observed within increasing mean strain for constant strain amplitude.  P91 steel undergoes cyclic softening i.e. decrease in stress amplitude with number of cycles.  During asymmetric loading mean stress relaxation is observed. Mean stress tends to relax rapidly and thereafter stabilizes to certain value.  The effect of mean strain on the relaxation of mean stress is satisfactorily predicted by the cyclic plastic material model.

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