ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 7

Crack Tip Opening Displacement (CTOD) Toughness Evaluation by ASTM E 1290 and BS5762: A Comparative Analysis

Bhattacharya, S
Centre for Materials Science and Technology, Indian Institute of Technology-Delhi, New Delhi,

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

(Received 27 March 1991; accepted 26 August 1991)

Abstract

ASTM Committee E-24 on Fracture has recently standardized the crack tip opening displacement (CTOD) measurement method. Three major differences between the ASTM E 1290-89 method and British Standard BS5762:1979 are outlined, and the influence of these differences on the critical crack initiation CTOD value is studied. The study is based on a typical fatigue crack and slow crack growth front profile. A difference of up to 6% in the CTOD values between the two standards, irrespective of the slow crack growth size, was found in the present study. However, a marginal ditterence of only 2% in the initiation CTOD value could be observed for the slow crack growth situation considered.

Keywords:
elastic CTOD, plastic CTOD, crack size, rotational factor, R-curve

Paper ID: JTE11906J
DOI: 10.1520/JTE11906J
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