Experimental investigation on weak shock wave mitigation characteristics of flexible polyurethane foam and polyurea
作者机构:State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijing100081China Institute for Advanced TechnologyShandong UniversityJinan250061China
出 版 物:《Defence Technology(防务技术)》 (Defence Technology)
年 卷 期:2024年第31卷第1期
页 面:179-191页
核心收录:
学科分类:08[工学] 0826[工学-兵器科学与技术]
基 金:supported by the National Natural Science Foundation of China(Grant Nos.12221002 12102233)
主 题:Free-field explosion Weak shock wave mitigation Polyurea Polyurethane foam Multi-layered composites
摘 要:In recent years,explosion shock wave has been considered as a signature injury of the current military *** strong shock wave is lethal to the human body,weak shock wave can cause many more lasting *** investigate the protection ability and characteristics of flexible materials and structures under weak shock wave loading,the blast wave produced by TNT explosive is loaded on the polyurethane foam with the density of 200.0 kg/m3(F-200)and 400.0 kg/m3(F-400),polyurea with the density of 1100.0 kg/m^(3)(P-1100)and structures composed of the two materials,which are intended for individual *** results indicate that the shock wave is attenuated to weak pressure disturbance after interacting with the flexible materials which are not *** shock wave protective capability of single-layer materials is dependent on their thickness,density and microscopic *** overpressure,maximum pressure rise rate and impulse of transmitted wave decrease exponentially with increase in sample *** the same thickness,F-400 provides better protective capability than F-200 while P-1100 shows the best protective capability among the three *** this study,as the materials are not destroyed,F-200 with a thickness more than10.0 mm,F-400 with a thickness more than 4.0 mm,and P-1100 with a thickness more than 1.0 mm can attenuate the overpressure amplitude more than 90.0%.Further,multi-layer flexible composites are *** layer layouts of designed structures and layer thickness of the single-layer materials can affect the protective *** the research range,the structure in which polyurea is placed on the impact side shows the optimal shock wave protective performance,and the thicknesses of polyurea and polyurethane foam are 1.0 mm and 4.0 mm *** overpressure attenuation rate reached maximum value of 93.3%and impulse attenuation capacity of this structure are better than those of s