Fracture Toughness Prediction under Compressive Residual Stress by Using a Stress-Distribution T-Scaling Method

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ID: 115042
2017
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Abstract
The improvement in the fracture toughness Jc of a material in the ductile-to-brittle transition temperature region due to compressive residual stress (CRS) was considered in this study. A straightforward fracture prediction was performed for a specimen with mechanical CRS by using the T-scaling method, which was originally proposed to scale the fracture stress distributions between different temperatures. The method was validated for a 780-MPa-class high-strength steel and 0.45% carbon steel. The results showed that the scaled stress distributions at fracture loads without and with CRS are the same, and that Jc improvement was caused by the loss in the one-to-one correspondence between J and the crack-tip stress distribution. The proposed method is advantageous in possibly predicting fracture loads for specimens with CRS by using only the stress–strain relationship, and by performing elastic-plastic finite element analysis, i.e., without performing fracture toughness testing on specimens without CRS.
Reference Key
meshii2017metalsfracture Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Toshiyuki Meshii;Kenichi Ishihara;Meshii, Toshiyuki;Ishihara, Kenichi;
Journal metals
Year 2017
DOI
10.3390/met8010006
URL
https://doi.org/10.3390/met8010006
Keywords
compressive residual stress fracture toughness ductile-to-brittle transition temperature region small-scale yielding single-edge notched bend bar stress-distribution scaling t-scaling method stress–strain relationship

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