Evaluation of Fatigue Damage under Low-cycle Long-term Isothermal and Nonisothermal Loading Conditions.

A method is suggested to estimate damage under low-cyclic long-term isothermal and nonisothermal loading taking account of the law of changes in temperature, deformation rate and stress sign in the cycle. Results of damage calculations from proposed dependences and on the basis of experimental specimen life values corresponding to uniaxial tension-compression are discussed for various forms of independent loading and heating cycles. A possibility is considered for extending the results obtained to a case of a complex stressed state.