International Journal of Impact Engineering ( IF 5.1 ) Pub Date : 2021-07-14 , DOI: 10.1016/j.ijimpeng.2021.103963 Loïc Tadrist 1 , Baptiste Darbois Texier 2 , François Lanzetta 3 , Lounès Tadrist 4
Pressurised membranes are used in various situations involving humans (protections, sports, etc). In this context, impacts mechanics of membranes is critical since under or over inflated membranes may create injuries. The effect of inflation pressure on contact time is investigated on a model experiment using a spherical membrane. Both gas pressure and impact speed decrease contact time. Direct measurements of gas pressure and temperature variations indicate an adiabatic compression in strong interaction with the membrane. The contact time of an inflated membrane is described by three dimensionless numbers, (i) the relative inflation , (ii) the presso-elactic number that considers the gas-membrane interaction and (iii) the presso-inertial number that scales membrane inertia to pressure forces. A model of pressurised membrane impact is provided and compared with experiments. It shows that contact time depends mainly on with corrections on and .
中文翻译:
加压膜的影响:接触时间
加压膜用于涉及人类的各种情况(保护、运动等)。在这种情况下,膜的冲击力学至关重要,因为充气不足或过度膨胀的膜可能会造成伤害。在使用球形膜的模型实验中研究了充气压力对接触时间的影响。气压和冲击速度都会减少接触时间。气体压力和温度变化的直接测量表明与膜强烈相互作用的绝热压缩。膨胀膜的接触时间由三个无量纲数描述,(i) 相对膨胀, (ii) 压弹性数 考虑气膜相互作用和 (iii) 压力惯性数 将膜惯性缩放为压力。提供了加压膜冲击模型并与实验进行了比较。这表明接触时间主要取决于 有更正 和 .