摘要
为分析充气压力对空气衬垫缓冲防护性能的影响,综合空气垫薄膜材料的拉伸变形和气室的压缩变形,建立了空气垫的冲击压缩力学模型。分析表明增大充气压力的总体效果是将使气垫的动刚度、承受的冲击载荷下降。原因是增大充气压力将使气垫薄膜在冲击过程的拉伸变形增大,气垫的体积比V0/Vt减小,而体积比在动刚度模型中是比充气压力更高阶的项。结合空气垫的弹性变形吸能机理分析,表明气垫薄膜的弹性变形可延长冲击载荷作用时间和吸能时间,从而提高空气垫的缓冲防护性能。对不同充气压力和气室宽度的空气垫,用7.5 kg的重锤进行冲击试验,结果表明:在不超过薄膜弹性限值的前提下,增大气垫的充气压力可降低气垫承受的冲击载荷峰值,提高气垫的缓冲防护性能,充气压力每增加20 k Pa,冲击载荷峰值降低10%以上。
To study the influence of inflation pressure of air cushion and the deformation of thin film on impact load, a model of air shock compression was established. The analysis result indicates that the general effect of the increasing inflation pressure is the decrease of the dynamic stiffness and the impact load of air cushion. The reason is that the increasing inflation pressure will make the air cushion film increase during the process of impact tensile deformation, and decrease the volume ratio of air cushion. The volume ratio is higher than inflation pressure in the model. Based on the energy absorption mechanism of the elastic deformation air cushion, the elastic deformation of air cushion film can improve the cushioning protective performance of air cushion by prolonging the acting time of the impact load and the absorbing energy. The results of tests show that under the premise of plastic yield limit of the thin film, the increasing air cushion gas pressure can reduce the peak impact load of air cushion and improve the buffer protection performance of air cushion. The peak impact load reduces more than 10% when the air pressure increases every 20 kPa.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第20期226-229,230,共5页
Journal of Vibration and Shock
基金
黑龙江省教育厅科学技术研究项目(12521130)
黑龙江省教育厅研究生创新基金项目(YJSCX2011-179HSD)
关键词
空气衬垫
充气压力
薄膜变形
缓冲性能
冲击试验
air cushion
inflation pressure
membrane deformation
buffer mechanism
impact test
