Abstract
Under multiaxial loading conditions, high temperature fatigue crack growth tests for SUS 304 stainless steel was conducted. In this study, effects of applied stress level on multiaxial fatigue crack growth were examined experimentally. DC electrical potential drop method was applied to thin-walled cylindrical specimen subjected cyclic tension and torsion. Effects of stress components Δσ and Δτ , and applied equivalent stress range, Δσeq on multiaxial fatigue crack growth characteristics, fatigue life, Nf , and crack propagation life, Np are examined. Crack propagation life, Np can be correlated with maximum principal stress range,Δσ1, whereas relationship between fatigue crack growth rate, db/dN and stress intensity range, ΔKIb, which is expressed as a function of Δσ1 , was affected by ratio of combined stresses, Δτ/Δσ.
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