Fracture Properties of Metals under Rapid Heating and Loading

摘要

The phenomenon of the fracture of metals under rapid heating and loading has been studied. An impact-pendulum testing technique combined with laser heating was developed. The energy absorbed to fracture the specimens, the surface temperature, the deformation and the impact force were measured. Experimental results give evidence of a high temperature transition in fracture properties. A microscopic-investigation technique was developed using high-speed cameras to observe the propagation of the fracture-metal grain-level cracks which were identified as liquation cracks. The properties of these cracks are related to the observed fracture mechanism.