Fracture criterion developed for elastic-plastic Russian materials

Abstract

One of the ways to maximize the safety of metal structures and components is to use elastic-plastic materials instead of brittle ones. The use of such materials reduces the probability of catastrophic failure occurring from crack like flaws that may have resulted from the manufacturing process or during the operational life. However, within the field of fracture mechanics, the criterion of brittle fracture is more developed than brittle-plastic fracture criteria. This paper deals with the analysis of universal fracture criteria, which are suitable not only for elastic materials with the brittle fracture, but also for elastic-plastic materials with the elastic-plastic fracture. An analytical two-parametrical fracture criterion has been proposed for static loading, which is validated experimentally and compared with the behaviour of perfectly plastic and elastic specific Russian materials. It allows the fracture resistance of structural components made of elastic-plastic materials to be evaluated more precisely.