摘要
采用LS-DYNA有限元分析程序,对不同约束形式下半球阻波结构体球壳的等效应力进行数值模拟,并与实验结果进行对比分析。结果表明,球壳在排烟口、出入口部位存在着不同程度的应力集中现象,局部应力远远超出其他部位;除应力集中部位外,球壳高度约3/4处的应力最大。当球壳底部完全自由时,球壳整体的应力水平大大下降,采用球底面自由放置方法可以进一步提高球壳抗内爆能力。对应力集中部位进行补强降后,实验应力最大部位与计算结果吻合。采用球底面自由放置于地面的设计,不仅提高了球壳的抗爆能力,也节省了地基处理,大幅度地降低了阻波结构体的造价。
The equivalent stresses of hemispherical shock-waves trap structure were calculated by the finite element program LS-DYNA for different constraint forms and compared with the experimental results. The results show that the stress concentration happens on the shell near the entrance and exhaust port and the local stresses are far higher than those of other parts. In addition to the site of stress concentration, the maximum stress is at the three-fourth of the height for the scale spherical shell model. The overall stress level decreases significantly for the spherical shell with the free bottom. Using the free base to place the spherical shell can further enhance its capacity against spherical implosion. Contrasting with the experiments, the maximum stress location is in line with the numerical results after reinforcing parts of stress concentration. By using the free base to place the spherical shell on the ground in the design, it can not only improve the anti-explosion capacity of spherical shells, but also save the foundation treatment, substantially reduces the cost of hemispherical shock waves trap structures.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2010年第1期7-11,共5页
Explosion and Shock Waves
基金
大连理工大学理学学科研究基金项目(SFDUT07012)
关键词
爆炸力学
应力
约束
爆炸容器
冲击波
mechanics of explosion
stress
constraint
explosive vessel
shock waves
