摘要
应用ANSYS程序,对螺旋切槽孔松动爆破进行空间弹性和弹塑性的数值分析,得到:1)在螺旋切槽孔内应力分布是不均匀的,在切槽尖端附近,有集中拉应力作用;2)在整个螺旋切槽孔内存在拉压间隔分区,在距离切槽尖端较远处,应力变化较慢,而在距切槽尖端较近处,应力变化急剧增加;3)通过弹塑性分析,塑性区在切槽尖端产生,随着荷载加大,塑性区面积在切尖扩大并向切尖方向发展.因此,裂纹在切槽尖端产生,裂纹的扩展方向也是塑性区的继续扩展的方向,即沿切槽尖端方向扩展.
ANSYS program is applied to the numerical analysis on the space flexibility and elastoplasticity of a spiral V-notch, which suggests that： 1 ）The stress distribution is uneven inside the spiral V-notch as tensile stress is focused near the tip of the notch. 2）Tensile stress and compressive stress areas are located alternatively inside the whole notch, the stress changes slower at a point farther from a crack tip, and much faster at a nearer point. 3） Elastoplasticity study finds that there exists at the tip of the crack a plastic zone that expand and extend to the direction of the tip with increase load so that cracks initiate at the tip of the notch and extend in the direction of the tip.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第12期125-129,共5页
Journal of Chongqing University
基金
重庆市科委资助项目(99-5489)
关键词
螺旋切槽
松动爆破
数值分析
spiral V-notch
loosen blasting
numerical calculation
