Mechanism to reduce skin abrasion under impact load

近年来，SRS安全气囊系统在新汽车上的配备比例越来越高。SRS安全气囊系统技术已经发展成熟，可以说SRS安全气囊系统可以在汽车事故中保护乘员免受冲击。实际上，SRS安全气囊的使用大大降低了死亡和重大事故的发生率。但据报道，在碰撞中，当乘员接触到打开的SRS气囊时，他们的面部和头部都有擦伤，我们推测SRS气囊与乘员之间的摩擦力是造成擦伤的原因。本文研究了SRS气囊材料在冲击载荷作用下的摩擦特性。为了研究SRS气囊材料在冲击载荷作用下的摩擦特性，建立了一套冲击试验装置，参照典型的气囊压力-时间历程，研制了一套测试气囊材料高速充气时冲击载荷的装置。当气囊中的压力增加时，冲击载荷增加。此外，随着车身与气囊的间隔缩短，施加到车身的冲击载荷变大。给出了不同试样、不同实验条件下压入比与压入比的关系。

In recent years, the equip ratio of SRS air bag system in new cars is increasing. Technology of SRS air bag system has been developed and it can be said that SRS air bag system can protect crews from impact in the car accident. In fact, the number of death and serious accident has been decreased by SRS air bag. Bat it is reported that crews got some abrasion on their faces and heads when they touched the opened SRS air bag under collision.We presume that the frictional force between SRS air bag and crew causes the abrasion. In this study, we investigate frictional characteristic of SRS air bag materials under the impact load. To examine frictional characteristic of SRS air bag materials under the impact load, we constructed an impact test apparatus.We have referred to a typical pressure-time history of an airbag, and a device is developed to measure impact load when the fabric is inflating at high speed. When pressure in a airbag increases, impact load increases. Also, impact load given to a body becomes large as shortens spacing with the body and an airbag. Relation between indenting ratio and pressure ratio give a single for different sample and different experimental condition.