摘要 [目的]为探讨聚脲涂层对钢板抗爆性能的提升机制,掌握背涂聚脲层对钢板动响应特性的影响规律,对钢板/聚脲复合结构的抗爆动响应过程进行仿真研究。[方法]采用LS-DYNA软件对钢板/聚脲复合结构在近距空爆载荷作用下的变形/失效过程及吸能机制进行数值仿真,并与文献试验结果进行对比,验证数值仿真方法的合理性和准确性。在此基础上,进一步分析前侧钢板层与背侧聚脲层的厚度配比及强度配比对结构变形/失效及能量吸收的影响。[结果]结果表明:背侧聚脲层在抗爆过程中存在二次崩落现象,其崩落碎片动能在后侧聚脲层总吸能中占主导地位;随着钢板−聚脲厚度比值的增加,前侧钢板层的最大塑性变形先减小后增大;随着强度比值增大,钢板的最大塑性变形和聚脲的吸能占比均单调减小。近距空爆载荷作用下,由于崩落而形成的碎片动能是后侧聚脲层的主要吸能方式;总面密度不变时,钢板/聚脲复合结构存在抗爆性能最优的厚度配比;强度比值的增大会降低聚脲层的吸能占比,同时提升结构的整体抗爆性能。[结论]研究结果可为钢板/聚脲复合结构的抗爆防护设计提供参考。 [Objectives]A simulation of steel/polyurea composite structures under close-range air blast loading was conducted,in order to study the improvement mechanism and analyze the influence of the polyurea backing layer on the blast-resistant performance of steel plates.[Methods]The deformation/failure process and energy absorption mechanism of steel/polyurea composite structures under close-range air blast loading were numerically investigated,and the rationality and effectiveness of the numerical investigation were verified by related experiments.On this basis,the influence of the thickness matching and strength matching between the front steel plate and the back polyurea layer on the deformation/failure and energy absorption of the structure were analyzed.[Results]The results show that the polyurea layer had two caving phenomena under blast loading,and the kinetic energy of the fragment was dominant in the total absorption energy of the polyurea layer.With the increase of the thickness matching between steel plate and polyurea layer,the deformation of the steel plate initially decreased,and then increased.With the increase of strength matching,the deformation of the front plate,and the energy absorption ratio of polyurea decreased monotonically.The kinetic energy of the fragment produced by caving was the main energy absorption mode of the polyurea layer.Under conditions of constant overall surface density,the steel/polyurea composite structure has the optimal thickness matching of anti-explosion performance.The increase of strength matching will decrease the energy absorption ratio of the polyurea layer,and the overall blast-resistant capacity will be improved.[Conclusions]The research in this paper serves as a valuable reference for the future study of the blast resistance capacity of polyurea-coated 304 stainless steel plates.
机构地区 华中科技大学船舶与海洋工程学院
出处 《中国舰船研究》 CSCD 北大核心 2021年第2期116-124,共9页 Chinese Journal of Ship Research
基金 中央高校基本科研业务费专项资金资助项目(2019kfyXJJS007) 国家自然科学基金资助项目(51679098)。
关键词 聚脲涂覆钢板 近距空爆载荷 动响应 厚度配比 强度配比 polyurea-coated steel plate close-range air blast load dynamic response thickness matching strength matching
