水射流下含表面裂纹的轮胎橡胶的动态断裂  

Dynamic Fracture of Tyre Rubber with Surface Cracks under Water Jet Impact

作　　者：谢仁婷 宋守许[1] 王玉琳[1] 田光涛[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院,安徽合肥230009

出　　处：《材料科学与工程学报》2015年第2期268-273,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51175139)

摘　　要：运用ANSYS/Explicit Dynamic模块,建立了含表面裂纹的轮胎橡胶材料在高压水射流作用下的流固耦合模型,分析了轮胎橡胶材料裂纹面应变分布规律;利用应变能密度函数,研究了含表面裂纹的轮胎橡胶材料在高压水射流作用下的动态断裂机理。通过对轮胎橡胶材料断面进行扫描电镜观察,初步分析了应变分布和应变能密度分布与粒度和微观形貌的关系。结果表明,在扩展与剪切的共同作用下,裂纹断裂形成与初始表面裂纹形貌一致的半椭圆形断面;随着裂纹长度的增加,裂纹扩展区的长度并未增加;多裂纹间耦合形成与初始裂纹大小一致的橡胶颗粒。In the presence of high pressure water jet, the fluid-solid coupling model of tyre rubber containing surface cracks was established with the aid of ANSYS/Explicit Dynamic module. The strain distribution of crack surface of tyre rubber material was analyzed. The dynamic fracture mechanism of tyre rubber material containing surface cracks under high pressure water jet impaction was studied using strain energy density function. Scanning Electron Microscopy （SEM） was used to view the fracture surface of tyre rubber material. The relationship between strain distribution, strain energy density distribution and particle size, fracture surface morphology was analyzed for the first step. The results show that, with the help of propagating and shearing, the semi-elliptical cross sections are formed in accordance with the initial surface crack morphologies. With increasing crack length, the crack propagation length does not increase. The rubber particles with initial crack sizes are formed due to mutual coupling between multiple cracks.

关 键 词：轮胎橡胶 应变分布 应变能密度 裂纹扩展 

分 类 号：TH145.41[一般工业技术—材料科学与工程] TQ330.73[机械工程—机械制造及自动化]