关键词: 疲劳, 能量理论, Neuber准则, 当量应变能密度准则

Abstract: Analysis of notched specimen of elasticplastic materials by using Neuber rule always lead to over high estimated values of local stress and strain. So conservative initiallife results were usually obtained. Since the coefficient was added to equivalent strain energy density rule on the basis of the plastic deformation item of Neuber rule, the local stress and strain estimation results should be more accurate. According to energy method, elasticplasticity strain energy density of material in the case of cyclic loading was discussed. It was discovered that the plastic strain density was taken into account by the ESED rule, and this was the energy theory basis for the further lower values of local stresses estimated by ESED rule than those obtained by Neuber rule. The above conclusion agreed well with fatigue test.

Key words: energy theory, Neuber rule, ESED rule , fatigue