防爆罩强度的数值模拟及设计优化

王竟成1，郭进勇2

（1.西南技术工程研究所　环境试验中心，重庆　400000；2.西南自动化研究所　装药中心，四川　绵阳　621000）

摘　要：采用有限元法对某高危工序的防爆罩强度进行校核与设计，考察罩体对爆炸冲击波的防护作用。理论估算与数值仿真表明，15 mm 厚的防爆罩不满足防护要求；将壁厚调整为30 mm，并设计顶部泄爆口，在冲击波作用下罩体壁面虽仍有较大塑性变形区，失效区仅为顶部泄爆口附近较小的区域。危险区域由四周壁面转移到顶部，较好地保障了周围设备与人员的安全。

关键词：数值模拟；强度；冲击波；防护；泄爆

Simulation and design of protective cover under blast shock(www.xing528.com)

WANG Jingcheng1，GUO Jinyong2

（Southwest Technology and Engineering Research Institute，Chongqing 40000，China；Southwest Automation Research Institute，Mianyang 621000，China）

Abstract：In order to judge its performance under shockwave resulting from unexpected detonation in certain high-risk process，the strength of protective cover is examined and redesigned by finite element method.Theo⁃retical estimation and numerical simulations confirm that the cover with 15mm in thickness would fail under the present shockwave.Then the thickness is enhanced to 30 mm and two vents are designed on the roof wall.Results show that although large plastic regions still generate on the wall，failure regions only emerge around the vests on the top.Since the danger areas are shifted from the side faces to the top，the safety of equipments and staff is guaranteed.

Key words：numerical simulation；strength；shockwave；protective cover；explosive venting