热空气老化下黏弹性阻尼硅橡胶寿命预测模型

Life prediction model of viscoelastic damping silicon rubber under hot air aging

以压缩永久变形为寿命分析研究对象,研究了常用工况下老化时间对黏弹性阻尼硅橡胶的储能模量、损耗模量及损耗因子的影响,同时采用热空气加速老化试验方法探究了黏弹性阻尼硅橡胶在不同温度(348,363,378,393 K)下压缩永久变形性能保持系数随老化时间的变化规律,并通过对两种老化动力学模型进行研究分析和修正获得了黏弹性阻尼硅橡胶的老化反应速率,此外,还对不同老化动力学模型下老化反应速率对Arrhenius模型的非线性行为进行了分段研究,推测了黏弹性阻尼硅橡胶的储存寿命。结果表明,在室温(298 K)下两种老化动力学模型在储存寿命为10.0 a时的压缩永久变形性能保持系数均为0.60;当选择压缩永久变形性能保持系数为0.50作为失效判据时,黏弹性阻尼硅橡胶的储存寿命分别为20.0 a和19.2 a,使用两种模型所得黏弹性阻尼硅橡胶的储存寿命误差仅为4%。

The effect of aging time on storage modulus,loss modulus and loss factor of viscoelastic damping silicone rubber were studied with retention rate of compression permanent deformation as the research object of life analysis under common wor-king conditions,and at the same time the variation of retention rate of compression permanent deformation of viscoelastic damping silicone rubber with aging time at different temperatures(348,363,378,393 K)was explored employing the hot air accele-rated aging test method.The aging reaction rate of viscoelastic damping silicone rubber was obtained by studying and revising two types of aging kinetic models.In addition,the nonlinear behavior of aging reaction rates on the Arrhenius model under different aging kinetic models was studied,and the storage life of viscoelastic damping silicone rubber was estima-ted.The results showed that retention rate of compression permanent deformation of the two types of aging dynamic models at room temperature(298 K)were all 0.60 when the storage life was 10.0 a.When retention rate of compression permanent deformation of 0.50 was chosen as the failure criteria,the storage life of viscoelastic damping silicone rubber were 20.0and 19.2 a respectively,and the storage life error of viscoelastic damping silicone rubber derived from the two types of aging dynamic models was only 4%.