恒幅载荷下填充天然橡胶概率疲劳寿命预测模型  

Probabilistic Fatigue Life Prediction Model for Filled Natural Rubber under Constant Amplitude Loading

作　　者：刘湘楠 许靖伟 LIU Xiangnan;XU Jingwei(School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan,Hunan,411201;School of Mechanical&Automotive Engineering,South China University of Technology,Guangzhou,510641)

机构地区：[1]湖南科技大学机电工程学院,湘潭411201 [2]华南理工大学机械与汽车工程学院,广州510641

出　　处：《中国机械工程》2024年第8期1366-1372,共7页China Mechanical Engineering

基　　金：国家自然科学基金(52175084)。

摘　　要：建立一种条件概率分布模型来描述任意应变水平下的橡胶疲劳寿命分布规律。开展了不同应变水平下的橡胶单轴拉伸疲劳试验,分析了橡胶疲劳寿命的分布规律,并采用极大似然估计法确定了橡胶疲劳寿命概率分布模型的参数值。采用最小二乘法拟合了应变水平与概率分布模型参数值之间的函数关系,并建立了条件概率的分布模型。开展了橡胶疲劳可靠度的评估,建立了橡胶P-ε-N模型,通过与实测寿命的比较,验证了橡胶P-ε-N模型的有效性。A conditional probability distribution model was proposed to quantify the distribution law of rubber fatigue life under arbitrary strain levels.The uniaxial tensile fatigue tests of rubber under different strain levels were carried out.The distribution law of rubber fatigue life was analyzed,and the parameter values of the probability distribution model were determined by a great likelihood estimation method.The least squares method was used to fit the functional relationship between strain level and parameter values of the probability distribution model,and then the conditional probability distribution model was established.The rubber fatigue reliability assessment was carried out,and the rubber P-ε-N model was established.The validity of the rubber P-ε-N model was verified by comparison with the measured lifetimes.

关 键 词：橡胶 疲劳寿命 概率分布 P-ε-N模型 可靠度 

分 类 号：TQ333[化学工程—橡胶工业]