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

A Fractographic Technique for the Estimation of Initiation Fracture Toughness J_Ic for Ductile Materials

Srinivas, M
Scientists, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad,

Kamat, SV
Scientists, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad,

Rao, PR
Honorary professor, Jawaharial Nehru Centre for Advanced Scientific Research, Bangalore,

(Received 25 August 1993; accepted 14 February 1994)

Abstract

A single specimen fractographic technique based on critical stretch zone width measurements is suggested for the estimation of fracture toughness (J_Ic) for highly ductile materials. The salient feature of this technique is that it overcomes the problem of fatigue precracking and is able to predict the fracture toughness of a material using a blunt notch specimen. Fracture toughness tests on commercially pure Armco iron, nickel, and aluminum as well as Al-Mn based austenitic stainless steel and En28 steel were carried out to validate the method.

Keywords:
JIc, single specimen, stretch zone width, blunt notch

Paper ID: JTE11838J
DOI: 10.1520/JTE11838J
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