【摘要】 研究了交通事故中汽车风挡玻璃的吸能特性对行人头部的保护。通过准静态压缩实验,获得了聚乙烯醇缩丁醛(PVB)夹层玻璃材料的应力—应变关系。利用Ls-Dyna软件构建有限元动力学模型,并将实测应力—应变曲线嵌入该模型,模拟了PVB夹层风挡玻璃在人体头部冲击下的力学响应。利用风挡玻璃的动能吸收比,比较了在不同冲击条件下风挡玻璃的吸能效果。结果表明:在冲击速度为5～7.5m/s、冲击角度为15°～45°的区间内,风挡玻璃的吸能效果相对明显,冲击位置对风挡玻璃的吸能效果影响较小。更多还原

【Abstract】 In traffic accidents,the energy absorption ability of windshield has an important influence on the protection of human head.Quasi-static compression test with polyvinyl butyral(PVB) laminated glass was carried out to acquire its stress-strain relationship.With the test result embedded,finite element model was established using Ls-Dyna.Mechanic behavior of the PVB laminated windshield under human head impact was studied,with kinetic absorptance of the windshield defined to investigate the absorption ability of the windshield for different impact conditions.The results show that the windshield can absorb more energy with impact velocities of 5—7.5 m/s and impact angles of 15°—45°,while the impact position has slight influence.更多还原