关键词: 韧性金属材料, 超声激励, 力学行为

Abstract:

In this paper the effect of ultrasonic action on the mechanical behaviors of ductile metal materials is investigated by both experimental and theoretical approaches. A new set of experiment systems is developed, which is used to purple copper and low carbon steel specimens, respectively. On the basis of those characters such as the plastic deformability, harden rate and flowability decreasing, the constitutive equations of ductile metal under the ultrasonic action are presented, and creep fracture is also discussed. It is shown that the theoretical model is in good agreement with experimental results, meanwhile the softening mechanism is also studied.

Key words: ductile metal, ultrasonic action, mechanical behaviors