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Metals 2018, 8(1), 6; https://doi.org/10.3390/met8010006

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

1
Faculty of Engineering, University of Fukui, Fukui 910-8507, Japan
2
Kobelco Research Institute, Inc. 1-5-5 Takatsukadai, Nishi-ku, Kobe, Hyogo 651-2271, Japan
*
Author to whom correspondence should be addressed.
Received: 23 November 2017 / Revised: 20 December 2017 / Accepted: 20 December 2017 / Published: 25 December 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. View Full-Text
Keywords: Fracture toughness; ductile-to-brittle transition temperature region; compressive residual stress; small-scale yielding; single-edge notched bend bar; stress-distribution scaling; T-scaling method; stress–strain relationship Fracture toughness; ductile-to-brittle transition temperature region; compressive residual stress; small-scale yielding; single-edge notched bend bar; stress-distribution scaling; T-scaling method; stress–strain relationship
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Meshii, T.; Ishihara, K. Fracture Toughness Prediction under Compressive Residual Stress by Using a Stress-Distribution T-Scaling Method. Metals 2018, 8, 6.

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