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A predictive method for the nonlinear viscoelastic characterization of carbon/epoxy fibre composites

机译：碳/环氧纤维复合材料非线性粘弹性表征的预测方法

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In the present work, a method for the characterization of the nonlinear viscoelastic response of a UD/90 deg carbon/epoxy composite is presented. Based on the characteristic creep-recovery response of the material, both analytical and numerical expressions for the nonlinear parameters included in the Schapery's constitutive thermodynamic equation were developed. The viscoplastic response developed during creep is also taken into account. For the full viscoelastic characterization of the material under consideration, creeprecovery tests at different applied stress levels were conducted. A generic function for the prediction of the variation of all the four parameters with the applied stress was developed. A minimum number of experimental data for the prediction of the nonlinear parameters is needed.
机译：在目前的工作中，提出了一种表征UD / 90度碳/环氧复合材料非线性粘弹性响应的方法。基于材料的特征蠕变回复响应，开发了Schapery本构热力学方程中包含的非线性参数的解析表达式和数值表达式。还考虑了蠕变过程中产生的粘塑性响应。为了充分考虑材料的粘弹性，在不同的施加应力水平下进行了蠕变恢复测试。开发了用于预测所有四个参数随施加应力变化的通用函数。需要最少数量的实验数据来预测非线性参数。

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