Investigation on fatigue crack growth behavior of Zr702/TA2/Q345R explosive welding composite plate with a through-wall crack

摘要

In this paper, the through-wall crack of Zr702/TA2/Q345R composite plate is studied by experiment and finite element method. The influence of loading parameters on crack growth rate, stress intensity factor, monotonic plastic zone and interaction effect between component materials are investigated. The elastic mismatch and yield strength between Q345R, TA2 and Zr702 leads to different crack driving force at the crack tip. Although the crack driving force is higher in component material with higher elastic module and yield strength, the crack growth rate of component materials in Zr702/TA2/Q345R composite plate is closely related to the ability of corresponding single material to resist crack propagation and the interaction effect between component materials. In addition, the fatigue crack propagation characteristic and damage mechanism are analyzed, and the effect of complex microstructures near Zr702/TA2 and TA2/Q345R interface on crack propagation behavior is clarified. Besides, it is found that the interface with higher properties mismatch preferentially delaminates.