Y. Gorash* and H. Chen This paper presents a creep–fatigue life assessment of a cruciform weldment made of the steel AISI type 316N(L) and subjected to reversed bending and cyclic dwells at 550uC using the linear matching method (LMM) and considering different weld zones. The design limits are estimated by the shakedown analysis using the LMM and elastic–perfectly plastic material model. The creep–fatigue analysis is implemented using the material models: Ramberg–Osgood model for plastic strains under saturated cyclic conditions and power law model in ‘time hardening’ form for creep strains during primary creep stage. The number of cycles to failure N* under creep–fatigue interaction is defined by relation for cycles to fatigue failure N* dependent on total strain range Detot for the fatigue damage vf, long term strength relation for the time to creep rupture t*dependent on average stress -sduring dwell Dt for the creep damage vcr and non-linear creep–fatigue interaction diagram for the total damage. Numerically estimated N* for different Dt and Detot shows good quantitative agreement with experiments. A parametric study of different dwell times Dt is used to formulate the functions for N* and residual life L* dependent on Dt and normalised bending moment ~ M.

Application of linear matching method to creep-fatigue failure analysis of cruciform weldment manufactured of austenitic steel AISI type 316N(L)

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Application of linear matching method to creep-fatigue failure analysis of cruciform weldment manufactured of austenitic steel AISI type 316N(L)