Research on the fatigue crack growth behavior of Zr/Ti/steel composite plate with a crack normal to interface

Abstract

Current work reveals the influence of loading parameters on the crack growth behavior of Zr/Ti/steel composite plate with a crack perpendicular to the interface by using experiment and finite element method. Finite element results reveal that loading parameters significantly affect hysteresis loop of Zr/Ti/steel composite plate, stress amplitude and the plastic strain accumulation degree of subsequent cyclic loading under different loading parameters. In addition, equivalent plastic strain at crack tip, its change rate and distribution are also explored in detail. Furthermore, it is also found that the elastic-plastic mismatch will also affect the plastic evolution, that is, strengthen or weaken the effect of loading parameters.