温度对动态孔洞增长的影响

Thermal Effect on Dynamic Cavitation

将孔洞化的概念推广到动态情况并考虑了温度效应对其影响.研究了弹塑性材料中一个球形孔洞从稳定到不稳定直到破坏的整个动态增长过程.得到了常载荷下孔洞增长率的封闭形式解．当孔洞半径趋于无穷，也就是失稳的极限情况下可得到孔洞增长率的一个有限值．此极限值与温度效应有关．文中还分析了孔洞增长时间随孔洞半径的变化规律，此规律也受到温度引起的热效应的影响.

In this paper, the concept of cavitation is extended to the dynamic case and the thermal effect on the cavitation is considered. The whole process of dynamic growth of a spherical void is investigated in the elastic-plastic material from the stable state to the unstable state until the failure of the material. A closed form for a void growth rate isobtained under the constant loading. When the radius of the void tends to infinite (i. e., a limitation case corresponding to the failure of the material), a finite value of the void growth is obtained. This limit value is related to the thermal effect. This paper also investigates the relationship between the void growth and the time. The relationship is alsoaffected by the thermal effect.