Low-Cycle Fatigue Life Prediction  UnderMultiaxial Non-Proportional Loads
Fu Delong,Zhang Li,Cheng Jin
(Department of Astronautic Science and Mechanics, Harbin Institute of Technology , Harbin 150001, China)

Abstract: According to the critical plane principle, a new mutilaxial fatigue damage parameter is proposed based upon the varying behaviour of the energy on the critical plane, where the non-proportional scale representing the grade of add itional hardening is introduced as a friction coefficient. By the linear damage accumulative rule, the relationship between the maximum damage and the fatigue cycles is derived and a new approach of predicting the multiaxial non-proportion allow cycle fatigue life is achieved. The experimental results of fatigue tests indicate a good agreement with the presented predictions.
Keywords: fatigue damage parameter, non-proportional scale, life prediction.