Aj. Krasowsky et G. Pluvinage, MINIMAL RESISTANCE OF ENGINEERING MATERIALS TO BRITTLE-FRACTURE AS PREDICTED BY LOCAL APPROACH, Journal de physique. IV, 6(C6), 1996, pp. 215-224
Two basic concepts of brittle fracture are considered: the first invol
ving stage-by-stage interatomic bonds decohesion at the crack tip, the
second - microcrack coalescence. Quantitative evaluation has been mad
e of the material threshold and minimal fracture toughness values whic
h correspond to the above concepts. The paper presents the analysis of
methods for the experimental evaluation of two main structure paramet
ers, 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 mate
rials fracture toughness from their conventional mechanical characteri
stics.