摘要
为描述填充橡胶材料的力学行为随温度和老化时间的变化规律,基于一阶Ogden模型提出了含热老化参数的本构关系.研究表明,Ogden模型中参数α在热老化初期几乎不随热老化条件变化.采用老化温度和老化时间叠加原理确定了热老化过程控制材料刚度变化的活化能,进一步通过Arrhen ius平移因子建立了时间温度相关的半经验本构关系,并应用于材料的疲劳性能研究.试验测试表明,在考虑疲劳过程热老化效应情况下,裂纹扩展速率与应变能释放率的关系符合Paris公式,而且考虑热老化效应计算得到的疲劳失效寿命比未考虑热老化效应的计算更接近试验结果.
A constitutive relation with respect to the thermal aging parameters is presented based on the oneorder Ogden model to describe the mechanical behaviors of filled rubber with or without thermal aging. It was found that the parameter α in the Ogden model was nearly independent of the aging temperature and aging time in the early stage of aging. The superposition principle between aging time and aging temperature was used to determine the activation energy in controlling the change of the stiffness of the filled rubber in thermal aging, and then an empirical temperature-time-dependent constitutive relation was established using an Arrhenius＇ s shift factor, by which the fatigue properties of the filled rubber were studied as an example. Test results show that the variation of the crack growth rate with the strain energy release rate calculated by considering the thermal aging effect follows the Paris law; and a closer estimation for the fatigue life with thermal aging consideration is obtained than that without thermal aging consideration.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2008年第9期1404-1407,共4页
Journal of Harbin Institute of Technology
基金
国家自然科学基金资助项目(10302008)
哈尔滨工业大学优秀青年教师培养计划资助项目(HITQNJS.2006.019)
关键词
填充橡胶
本构关系
热老化
疲劳
filled rubber
constitutive relation
thermal aging
fatigue
