PREDICTING METHOD FOR MULTIAXIAL CREEP FAILURE STRAIN OF MATERIAL

摘要

A predicting method for the multiaxial creep failure strain of a material, relating to the technical field of strain prediction. The method is characterized by comprising the following steps: step (1), acquiring the relation between the creep rate and strain rate of a material; step (2), obtaining uniaxial and multiaxial stress state parameters according to the theory of controlling void growth by power-law creep; step (3), indicating a creep failure strain under the actions of uniaxial and multiaxial stresses and obtaining a multiaxial creep ductility factor; step (4), obtaining multiaxial creep failure strain fitting parameters under different stress states so as to obtain a multiaxial creep ductility factor prediction equation; and step (5), predicting the creep failure strain and the life of the material under a multiaxial stress state by using a finite element software. The predicting method for the multiaxial creep failure strain of a material can more accurately predict the multiaxial creep failure strain of the material under a high temperature state by using a creep failure strain calculation method of the material under the multiaxial stress state.