异戊二烯
天然橡胶
材料科学
炭黑
复合材料
钢筋
联轴节(管道)
疲劳极限
循环应力
结构工程
工程类
共聚物
聚合物
作者
Ganfang Luo,Ziwei Song,Jiawei Guo,Chi Zhang,Xiaoniu Yang
摘要
Abstract This paper presents an extensive experimental investigation on fatigue properties of carbon‐black filled isoprene rubber under complex loadings. A basic life prediction model taking strain energy density as fatigue parameter is first proposed based on fatigue crack growth tests and uniaxial tension fatigue tests under relaxing loads at room temperature. A database of fatigue life including relaxing and non‐relaxing is established through a great number of fatigue tests under five temperatures. Based on the database, two empirical parameters, that is, temperature factor ( N RT / N HT ) and life reinforcement factor (Re), are introduced to quantitatively characterize the coupling effects of high temperature and non‐relaxing loads on fatigue life. The fatigue mechanisms under different conditions are compared via wide‐angle x‐ray diffraction tests and postmortem analysis. It reveals that the weakening of life reinforcement at high temperatures is closely related to the strain induced crystallization behavior of rubber.
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