摘要
利用任意拉格朗日与欧拉(ALE)方法,模拟球壳在爆炸载荷作用下的动力反直观行为,得到了球壳中点位移时程曲线以及最终变形模式等动力响应。在研究中,考虑了材料的应变率效应,并对球壳的矢高和厚度对其反直观行为的影响进行了参数分析。结果表明,只有炸药距球壳距离在特定范围内,球壳才能发生反直观行为;当炸药当量一定时,球壳发生反直观行为的爆心距区域段随球壳矢高增加而减少,矢跨比大于一定值后,将不会发生反直观行为。
The time hitory of displacement at midpoint of a spherical shell and its final deformation pattern were analysed numerically.The effect of strain rate was taken into account in the numerical analysis.The effects of the parameters,such as the arch rise and thickness on the anomalous response were examined.The results show that anomalous responses will take place only when the explosives are in particular distance apart from the spherical shell.With a certain amount of explosive charge,the region of anomalous response will decrease with the increase of each rise.The anomalous response will disappear when rise-span ratio exceeds a certain value.
出处
《振动与冲击》
EI
CSCD
北大核心
2011年第6期93-96,共4页
Journal of Vibration and Shock
基金
国家自然科学基金项目(10672112)
山西省自然科学基金(2009011036)资助项目
关键词
爆炸载荷
反直观行为
球壳
应变率效应
blast loading
anomalous response
spherical shell
effect of strain rate
