表征外部爆炸作用下舱段破坏的新型冲击因子研究

基于结构遮挡的冲击波能量提出了一种新型冲击因子.为验证该冲击因子在外部爆炸问题中的适用性,使用CONWEP算法对典型三舱段模型在不同装药工况下的响应进行非线性有限元数值仿真,并采用准静态法计算受损舱段的剩余极限强度.计算结果表明新型冲击因子相比传统冲击因子更适合用于表征外部爆炸作用下结构的整体破坏.对于远场爆炸工况,强力甲板最大位移、舱段塑形应变能和剩余极限强度在新型冲击因子衡量下均显示出较高的一致性.在近场爆炸工况中,由于结构局部变形的影响,计算结果存在一定的离散.

New Impulsive Factor in Representing Cabin Damage under External Air Explosion

Based on blast energy blocked by structure, a new impulsive factor is proposed. In order to assess its applicability in external air explosion condition, dynamic structural response of a three-cabin ship under blast loads with various detonation position and explosive mass were simulated by CONWEP algorithm, and residual ultimate strength of the damaged cabins was obtained by the quasi-static loading approach. The results indicated that new impulsive factor is more suitable in represent-ing overall structural damage under external explosive loading than the traditional one. For far-field detonation, maximum displacement of strength deck, cabin plastic energy and residual ultimate strength showed high consistency in the measure of new impulsive factor. In near-field detonation cases, results showed divergence due to local effects.