3D fracture mechanics investigation on surface fatigue crack propagation |
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Authors: | H SHEN W GUO |
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Affiliation: | 1. School of Aeronautics and Mechanics, Tongji University, Shanghai, 200092 China;2. School of Aeronautics and Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, 210025 China |
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Abstract: | Surface fatigue crack propagation is the typical failure mode of engineering structures. In this study, the experiment on surface fatigue crack propagation in 15MnVN steel plate is carried out, and the crack shape and propagation life are obtained. With the concept of ‘equivalent thickness’ brought into the latest three‐dimensional (3D) fracture mechanics theory, one closure model applicable to 3D fatigue crack is put forward. By using the above 3D crack‐closure model, the shape and propagation life of surface fatigue crack in 15MnVN plates are predicted. The simulative results show that the 3D fracture mechanics‐based closure model for 3D fatigue crack is effective. |
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Keywords: | crack closure 3D fracture mechanics equivalent thickness fatigue crack propagation surface fatigue crack |
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