Dahl A.,Laboratoire Of Mecanique Sols |
Dahl A.,Électricité de France |
Berdin C.,Laboratoire Of Mecanique Sols |
Berdin C.,University Paris - Sud |
Moinereau D.,Électricité de France
18th European Conference on Fracture: Fracture of Materials and Structures from Micro to Macro Scale | Year: 2010
The aim of this work is to study cleavage crack arrest features, in order to validate a local arrest criterion previously proposed  for crack arrest experiments on A533 Cl.B type steel. Crack arrest was obtained on CT specimens under isothermal conditions for temperatures ranging from-150°C up to-50°C (tests performed at CEA on pre-cracked discs. Fractographic observations showed shear steps on cleavage fractured surfaces. The density and the height of the steps increase near the crack arrest front. They depend on the test temperature, and on the geometry of the specimen. This can be related to the criterion depending on the temperature and to the local stresses. So, simulations of crack propagation and arrest with a probabilistic local criteria based on the maximal principal stress as in cleavage crack initiation, are presented and compared to the experimental results. Some elements near the crack arrest front are not fractured, reproducing a sort of shear steps. The simulation shows a weak dependence on the scatter of the critical stress: crack arrest depends on the mean value of the critical stress.