航空轮胎用橡胶弹性体Mullins效应动态加载方法

航空轮胎用橡胶弹性体在服役过程中遭受严苛的动态循环工况。为了研究弹性体在此工况下的力学响应特征和损伤机理，提出基于应力波作用的Mullins效应动态加载实验方法。根据应力波传导与作用特征，采用Hopkinson压杆加载思路，设计和配置了各单元尺寸参数，进而搭建可用于橡胶弹性体材料动态循环加载的实验系统，并开展了航空轮胎用丁苯橡胶的动态循环加载试验。基于试验信号分析发现：加载系统实现了弹性体材料Mullins效应动态应变递增的试验加载。最后开展加载测试参数的影响因素分析，结果表明通过优化系统各单元可实现Mullins效应的动态加、卸载参数的控制。

Dynamic loading technology for Mullins effect of rubber elastomer used in aeronautical tires

The rubber elastomers, widely used in aeronautical tires, are subject to experience severe dynamic cycling loading during their engineering service. In order to obtain their mechanical characteristics and potential damage mechanisms under those conditions, a dynamic loading methodology was proposed for performing Mullins effect experiments based on stress wave loading. According to the characteristics of stress wave propagation, the dimension parameters of each unit were designed and configured on the basis of Hopkinson pressure bar principle. An experimental system was then built for rubber elastomer materials, and the dynamic cyclic behavior of styrene-butadiene rubber used in tires was obtained. The analyses on the experimental original signals demonstrated that the system can obtain the increasing maximum strain during each cycle, which manifested the system can achieve the dynamic loading of Mullins effect for elastomer. Finally, the loading system specificaitons were discussed for obtaining controllable loading and unloading parameters after finely adjusting system components.