Bz. Margolin et Vi. Kostylev, ANALYSIS OF BIAXIAL LOADING EFFECT ON FRACTURE-TOUGHNESS OF REACTOR PRESSURE-VESSEL STEELS, International journal of pressure vessels and piping, 75(8), 1998, pp. 589-601
The local stress-strain state (SSS) near the crack tip and its connect
ion with the crack tip opening displacement and J-integral under biaxi
al loading have been studied by finite element methods in elastic-plas
tic finite strain statement. Numerical investigations have been perfor
med for various crack lengths and two types of biaxial loading (tensio
n and bending) under conditions of small- and large-scale yielding. To
predict the biaxial loading effect on cleavage fracture toughness, th
e procedure has been elaborated, this being based on the revealed regu
larities for SSS near the crack tip under biaxial loading and brittle
fracture criterion proposed earlier. Prediction of the biaxial loading
effect on cleavage fracture toughness has been performed as applied t
o reactor pressure vessel steel. The calculated results have been comp
ared with available experimental data. Alternative approaches for pred
iction of the biaxial loading effect on fracture toughness have been d
iscussed. (C) 1998 Elsevier Science Ltd. All rights reserved.