纤维复合材料粘弹性动态性能的细观力学分析

Meso-mechanical analysis on dynamic viscoelasticity of fiber-reinforced composites

建立了纤维增强复合材料粘弹性动态性能的细观力学模型。首先建立了树脂基体相各向同性的粘弹性模型,模型参数由纯树脂基体材料的蠕变试验获取,在此基础上分别建立了针对单向和正交铺层复合材料的横观各相同性、正交各相异性的细观粘弹性模型。对单向、正交铺层复合材料进行了静态和动态试验,分别通过试验和上述理论模型得到了其阻尼比、动态储存模量、损耗模量和损耗因子,理论预测与试验结果吻合。

Dynamic approaches for viscoelasticity of fiber-reinforced composites were pursued in this study.Firstly,an isotropic viscoelastic constitution was built to describe the time-dependent properties of epoxy matrix phase in composites.The parameters in the model were determined from creep experiment of pure epoxy.Then,transverse isotropic and orthogonal viscoelastic models were developed to represent the time-dependent behaviors of unidirectional composites and orthogonal layered laminates,respectively.Static and dynamic experiments for the mentioned composites were carried out.The predicted damping ratio,dynamic storage modulus,loss modulus and loss factor are all in good agreement with experimental results.