Research Progress on Evaluation Methods of Fracture Toughness and Fatigue Crack Growth in High-strength Steel

doi:10.3901/JME.2023.16.018

Abstract

Abstract: The issue of fatigue and fracture in high-strength steel has always been a hot research direction due to long time service under cyclic loading. Accurately evaluating the fatigue life and monitoring the service status of high-strength steel are crucial to ensure the safe operation of large equipment. With the development of fracture mechanics, damage tolerance design has become a significant fatigue fracture control method in industrial fields such as aviation, aerospace, nuclear power and high-speed railway. As the key parameters in damage tolerance design, accurately understanding of evaluation methods for fracture toughness and fatigue crack growth plays a significant connecting role in solving the bottleneck problem of integrity and reliability research on large components. In this study, the classification and failure of high-strength steels are firstly reviewed. Then, the characterization forms of fracture toughness and fatigue crack growth are analyzed. The small-sample methods for estimating fracture toughness are systematically elaborated from the size effect and energy criterion. The research progress on the quantitative relationship between tensile properties, impact toughness and fracture toughness are discussed. The models and methods of fatigue crack growth in the near-threshold region, steady-state region and whole-stage region are illustrated respectively. Additionally, the stress ratio and size effect on the fatigue crack growth of high-strength steel are emphasized. Finally, several open problems in the field of fracture toughness and fatigue crack growth are addressed for future studies.

Key words: high-strength steel, tensile strength, fracture toughness, impact toughness, fatigue crack growth

CLC Number:

TG142

LI Hefei, ZHANG Peng, ZHANG Zhefeng. Research Progress on Evaluation Methods of Fracture Toughness and Fatigue Crack Growth in High-strength Steel[J]. Journal of Mechanical Engineering, 2023, 59(16): 18-31.

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