Numerical computation of the energetic criterion at isothermal and thermal–mechanical cyclic tests under generalized plasticity of the F17TNb stainless steel

• The loading level has a positive effect on the ΔJ value.
• da/dN vs. ΔJ graph at 300 °C presents a linear dependence between ΔJ and crack growth rate in a log–log presentation.
• ΔJ is more significant and grows with the increase of crack size.
• The out of phase tests are more damaging than in phase ones.
• The out of phase test is most comparable with isothermal tests.

The aim of this work is to investigate the energetic integral J criterion in generalized plasticity of the F17TNb at isothermal and Thermal Mechanical Fatigue (TMF) tests using a numerical simulation. An optimization of the constitutive law based on mechanical results was carried out using ABAQUS standard solver. Isothermal tests showed that ΔJ evolution is higher at lower temperature (300 °C) and a has a linear dependence at log–log presentation with da/dN at 300 °C. TMF tests simulation showed that Out of Phase (OP) configuration is more damaging than In Phase (IP) tests. A comparison between OP and isothermal tests highlighted the greater value of ΔJ at isothermal tests.

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