随机参数影响下橡胶密封垫的应力松弛特性  

Stress Relaxation Characteristics of Rubber Gasket Under Effect of Random Parameters

作　　者：雷震宇 王志强 江竹 LEI Zhenyu;WANG Zhiqiang;JIANG Zhu(Institute of Rail Transit, Tongji University, Shanghai 201804, China;School of Energy and Power Engineering, Xihua University, Chengdu 610039, China)

机构地区：[1]同济大学铁道与城市轨道交通研究院,上海201804 [2]西华大学能源与动力工程学院,四川成都610039

出　　处：《同济大学学报（自然科学版）》2019年第4期535-539,共5页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(11772230;51408434);西华大学汽车工程四川省高校重点实验室开放基金(SZJJ2017-014);西华大学流体及动力机械教育部重点实验室开放基金(SZJJ2015034)

摘　　要：采用Mooney-Rivlin超弹性和Prony级数形式黏弹性模型,将有限元结果与试验数据对比,对模型参数进行验证.运用Ansys-PDS随机分析模块计算各随机参数对表面接触应力的灵敏度,以及超弹性和黏弹性参数变化对表面接触应力松弛特性的影响.结果表明:参数取值合理;对表面接触应力影响较大的随机参数为α_2和C_(10),α_1、τ_1和C_(01)的影响次之,而τ_2的影响可以忽略不计;松弛主要发生在加载第1天,1年内基本保持稳定;超弹性参数取值越大,应力衰减越小,黏弹性参数则相反.The Mooney-Rivlin hyperelastic model and the Prony series viscoelastic constitutive model were used to verify the selected calculation parameters by finite element analysis compared with stress relaxation test data. Then, the Ansys-PDS module was used to analyze the sensitivity values of all random parameters to surface contact stress and the influence of hyperelastic and viscoelastic parameters on the surface contact stress relaxation. The results show that parameter values are reasonable. Random parameters which have great influence on the surface contact stress are α2 and C10, followed by α1、τ1 and C01, and the effect of τ2 is negligible. Relaxation mainly occurred on the first day of loading and remained basically stable within 1 year. The larger the values of hyperelastic parameters, the smaller the stress attenuation is, and the opposite of viscoelastic parameters.

关 键 词：橡胶密封垫 应力松弛 随机有限元法 灵敏度分析 

分 类 号：TU455.43[建筑科学—岩土工程]