JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
Fatigue & Fracture
Statistical Aspects of Brittle Fracture in Low-Alloyed Steels
Bohumir STRNADELIvan NEDBALClaude PRIOULMasaki SHIRATORI
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2002 Volume 45 Issue 2 Pages 319-326

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Abstract

This paper presents a method for quantifying probability of brittle fracture in low alloy steels. The proposed method shows how the probability of brittle fracture varies with stress intensity factor, temperature, deformation characteristics and microstructural parameters of low-alloyed steel. Application of this method on Ni-Cr steel demonstrated very good agreement of predicted temperature dependence of scatter in brittle fracture toughness with experimental results. The method enables also to calculate characteristic distance as a radial dimension from the crack tip where microcrack initiation is most probable. The characteristic distance of investigated Ni-Cr steel was found to decrease with increasing temperature. Microstructural mechanisms of initiation and propagation of brittle fracture were identified from results of fractography analysis. The proposed procedure represents a foundation for systematic control of relationship between stress-strain behaviors, toughness and reliability of steel engineering parts.

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© 2002 by The Japan Society of Mechanical Engineers
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