On the problems of prediction of long-term fracture under creep

摘要

Some basic problems of long-term fracture modelling and time to fracture orediction under creep conditions are considered. Lifetime relations have obtained from the jpint solution of the equations system involving constitutive equations of the creep theory to set the irreversible deformation kinetics and the aging equations to set the embrittlement kinetics. The models of viscous, brittle and mixed fracture have been constructed and analyzed. The models are constructed on the basis of the technical creep theories and on the basis of the isochronous creep theory together with the exponential embrittlement law of a material.