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1 International Journal of Applied Mechanics and Engineering

1 2009

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3D fracture mechanics investigation on surface fatigue crack propagation

Shen H., Guo W., Lu G.

International Journal of Applied Mechanics and Engineering

2009

Vol. 14, no 4

1127-1138

Surface fatigue crack propagation is the typical failure mode of engineering structures. In this study the experiment on surface fatigue crack propagation in 15 MnVN steel plate is carried out and the crack-shape and propagation life are obtained. With the concept of "equivalent thickness" brought into the latest 3D (three dimensional) 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 15 MnVN plates are predicted. The simulative results show that the 3D fracture mechanics based closure model for 3D fatigue crack is effective.