Vol.8, No2, 2008, pp. 165-170
 UDC 539.42

DETERMINATION OF J RESISTANCE CURVE BY TWO POINTS METHOD

Ivo Blačić 1

Vencislav Grabulov 2

1 Military Technical Institute, Belgrade

2 Institute for Materials Testing IMS, Belgrade

Abstract

New approach for crack resistance curve design is proposed and the possibility of its application investigated. The approach is based on JR description by polynomial function with two coefficients. For determining coefficients two pairs of values of J integral and crack extension ∆a are necessary. One of them is determined experimentally. It is accepted that the second pair of values belongs to the blunting line, but additional criteria are also required. The possibility to establish these criteria for the second pair of values of J integral and crack extension ∆a is considered.

Keywords: J–R curve design, high strength steel, experimental verification, two points method

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