Applicability of Modified Ritchie-Knott-Rice Failure Criterion to Predict the Occurrence of Cleavage Fracture under Residual Stress Field

International Journal of Material Science and Engineering

© 2016 by SSRG - IJMSE Journal

Volume 2 Issue 2

Year of Publication : 2016

Authors : Kenichi Ishihara, Takeshi Hamada, and Toshiyuki Meshii

10.14445/23948884/IJMSE-V2I4P101

How to Cite?

Kenichi Ishihara, Takeshi Hamada, and Toshiyuki Meshii, "Applicability of Modified Ritchie-Knott-Rice Failure Criterion to Predict the Occurrence of Cleavage Fracture under Residual Stress Field," SSRG International Journal of Material Science and Engineering, vol. 2,  no. 2, pp. 1-6, 2016. Crossref, https://doi.org/10.14445/23948884/IJMSE-V2I4P101

Abstract:

This paper introduces our experience of applying the modified Ritchie-Knott-Rice (RKR) failure criterion (which predicts the occurrence of cleavage fracture when the mid-plane crack opening stress measured at four times the crack-tip opening displacement 22d exceeds a critical stress 22c) to the SE(B) specimen with a residual stress in the ductile to brittle transition temperature (DBTT) region. The fracture toughness test and elastic-plastic finite element analysis results are compared in this paper. 0.45 % carbon steel JIS S45C, whose tensile to yield stress ratio B/ YS was equal to 1.5 at fracture test temperature was considered in this study. Focus was placed on whether the modified RKR failure criterion can be applied to the test specimen with a compressive residual stress that was introduced by a mechanical preload at room temperature. SE(B) specimen of width W x thickness B of 46 x 23 mm were chosen. Results showed that the scatter of 22cs obtained from specimens with a compressive residual stress were small difference. In addition, the J corresponding to the load that 22d first reaches 22c seemed to predict the lower bound toughness for the material and the specified specimen configuration.

Keywords:

Modified Ritchie-Knott-Rice failure criterion, Fracture toughness, SE(B) specimen, Compressive residual stress.

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