1st European Mechanics of Materials Conference on Local Approach to Fracture '86 - 96'
J. Phys. IV France 06 (1996) C6-215-C6-224
Minimal Resistance of Engineering Materials to Brittle Fracture as Predicted by Local ApproachA.J. Krasowsky1 and G. Pluvinage2
1 Institute for Problems of Strength, National Academy of Science of Ukraine, 2 Timiryazevskaya str., Kiev 252014, Ukraine
2 University of Metz, Ile du Saulcy, 57045 Metz cedex, France
Two basic concepts of brittle fracture are considered : the first involving stage-by-stage interatomic bonds decohesion at the crack tip, the second - microcrack coalescence. Quantitative evaluation has been made of the material threshold and minimal fracture toughness values which correspond to the above concepts. The paper presents the analysis of methods for the experimental evaluation of two main structure parameters, which govern the material fracture, and discloses their physical meaning. These are the characteristic distance and cleavage stress. It also considers the methods of a priori express-evaluation of the materials fracture toughness from their conventional mechanical characteristics.
© EDP Sciences 1996