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A NEW METHOD FOR DETERMINING THE ACCURATE J-R CURVES OF STEELS
  • +2
  • Hui Gao,
  • Chun-Qing Li,
  • Weigang Wang,
  • Yanlin Wang,
  • Bohua Zhang
Hui Gao
RMIT University School of Engineering
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Chun-Qing Li
RMIT University School of Engineering
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Weigang Wang
RMIT University School of Engineering
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Yanlin Wang
RMIT University School of Engineering
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Bohua Zhang
RMIT University School of Engineering
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Abstract

Unloading compliance (UC) method and normalization method (NM) are two of the most commonly used methods for determining the fracture toughness of materials. However, considerable differences often exist in the fracture toughness determined by these two methods, which solicits a new method to determine the fracture toughness accurately. In this paper, the compliance of crack length differences as measured by the crack length difference ratio Si is discovered, analysed and verified by experiments. Based on this compliance, a new accurate method, known as AJR, is developed and verified by test results. Factors that exhibit the advantages of the developed new AJR method are also investigated. It is found that the J-R curves determined by the new AJR method are more accurate than those determined by UC and NM. The new AJR method should be the first choice for steels with a small strain hardening ratio and low effective yield strength, and thicker CT specimens with shallower initial crack length. This is because the disagreement between UC and NM is unacceptably large. The developed new AJR method and the results presented in this paper can assist engineers and researchers to determine J-R curves and fracture toughness of steels more accurately and can contribute to the body of knowledge of fracture mechanics.

Peer review status:ACCEPTED

08 Jan 2021Submitted to Fatigue & Fracture of Engineering Materials & Structures
09 Jan 2021Submission Checks Completed
09 Jan 2021Assigned to Editor
11 Jan 2021Reviewer(s) Assigned
31 Jan 2021Review(s) Completed, Editorial Evaluation Pending
15 Feb 2021Editorial Decision: Revise Major
23 Feb 20211st Revision Received
24 Feb 2021Submission Checks Completed
24 Feb 2021Assigned to Editor
24 Feb 2021Reviewer(s) Assigned
25 Feb 2021Review(s) Completed, Editorial Evaluation Pending
27 Feb 2021Editorial Decision: Accept