基于LS-DYNA的方孔网格型防爆网防爆性能研究

基于有限元程序LS-DYNA,在验证模型及参数可靠的基础上,对方孔网格型防爆网的防爆性能进行了三维数值模拟。通过计算冲击波超压减小率在防护面上的均值和方差,解决了防爆网防爆性能的量化标准问题。结果表明:防爆网可以有效减小爆炸对建筑的冲击,防爆效果与其和建筑之间的距离以及防爆网孔洞率、孔洞尺寸、厚度有关;适当增加防爆网与建筑之间的距离,可以获得良好的防爆效果;减小孔洞率或保持孔洞率不变的情况下减小孔洞尺寸,也可以提高防爆网的防爆性能;增加防爆网厚度可以有效减小爆炸对建筑的冲击作用,但也会使防爆的均匀性变差,因此通过增加防爆网厚度来提高其防爆性能时应兼顾考虑此两方面的问题。

RESEARCH ON ANTI-EXPLOSION PERFORMANCE OF SQUARE-HOLE EXPLOSION-PROOF MESH BASED ON LS-DYNA

Based on LS-DYNA and the reliability of the model and parameters,the three-dimensional numerical simulation for anti-explosion performance of the square-hole explosion-proof mesh was established.By calculating the mean and variance of decrease ratio of the shock wave overpressure on the protection,the quantitative criterion for evaluating the anti-explosion performance of explosion-proof mesh was solved.Results showed that explosion-proof mesh could mitigate the blast effect on building which was related to parameters such as distance between explosion-proof mesh and building,hole ratio,hole size and thickness of explosion-proof mesh.Methods such as properly increasing the distance between explosion-proof mesh and the building,decreasing the hole ratio or the hole size under the condition of the hole ratio unchanged could improve the anti-explosion performance.When the thickness of explosion-proof mesh was increased,the explosion impact effect acting on the building would mitigate effectively,whereas the uniformity of anti-explosion effect would become worse.So these should be taken into account when using method of increasing the thickness of explosion-proof mesh to improve the anti-explosion performance.