ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 8

Critical Assessment of Methods for J_Ic Determination

Pandey, RK
Centre for Materials Science and Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi,

Sundaram, P
Centre for Materials Science and Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi,

Kumar, AN
Centre for Materials Science and Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi,

(Received 22 October 1990; accepted 16 September 1991)

Abstract

Various methods for the evaluation of J-initiation toughness have been compared by conducting investigations on Mo and Cr-Mo steel at different temperatures (i.e., 30 to 460°C) by employing the single-edge-notch bending configuration. The methods investigated include ASTM Standard E 813, a method proposed by the European Group on Fracture (EGF), methods based on a stretch zone approach, and a proposed method of the Japan Society of Mechanical Engineers (JSME). The blunting line approach for toughness determination has been investigated in detail in the light of various propositions made by other investigators, and an equation for the blunting line has been proposed based on the findings from the present work as well as from literature data. A J-resistance curve based on mid-thickness crack growth combined with the stretch zone approach for the blunting line appears to provide a mose comsistent method for toughness determination.

Keywords:
blunting line, stretch zone width, initiation toughness, J-resistance curves, average crack growth, maximum crack growth

Paper ID: JTE11907J
DOI: 10.1520/JTE11907J
ASTM International is a member of CrossRef.