【摘要】 基于非局部连续介质力学理论,提出了一种解析方法,研究小尺度参数对具有应力作用下的晶内孔洞收缩速率和愈合历程的影响规律.算例表明,随着晶内孔洞尺寸减小,尺度效应对孔洞收缩速率的影响逐渐增强;由于小尺度效应的影响,仅在晶格扩散能量的驱动下,晶粒中的孔洞不能够完全消失,这与不考虑小尺度效应的晶内孔洞收缩速率和愈合历程有很大不同.研究结果揭示了受静水压力和外应力作用下的材料中损伤缺陷的自我修复机制,具有一定的理论参考意义.更多还原

【Abstract】 Based on a non-local elastic theory,an analytical method was presented to investigate the effects of small scale parameter on the shrinkage rate and the healing time history of a void in stressed grain.The example calculation shows that the effects of the small scale parameter on the shrinkage rate of a void in stressed grain gradually increase as the size of void decreases,and the void in grain is not eliminated only through lattice diffusion due to the small scale effect.The result gives a reference to reveal the self-healing mechanism of the damage defects in stressed materials subjected to hydrostatic pressures.更多还原