A micromechanical model is developed to study the creep phenomena with neat and carbon-fiber-reinforced PEEK (Polyetheretherketon) and epoxy. The model considers that the continuous elastic circular fibers form a regular array inside the matrix material. In this study, the fibers are considered to be linear elastic and anisotropic, while the matrix has a nonlinear viscoelastic behavior. The approach describes the time-dependent response of unidirectional viscoelastic composites subjected to various types of loading conditions. A comparison between the finite element analysis and the proposed micromechanical model shows a good agreement. Experimental tests validate the results obtained using the proposed theoretical model.

中文翻译：

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使用微机械模型确定的纯碳纤维增强 PEEK 和环氧树脂的蠕变响应

开发了一个微机械模型来研究纯碳纤维增强 PEEK（聚醚醚酮）和环氧树脂的蠕变现象。该模型认为连续弹性圆形纤维在基体材料内部形成规则阵列。在这项研究中，纤维被认为是线弹性和各向异性的，而基体具有非线性粘弹性行为。该方法描述了单向粘弹性复合材料在各种负载条件下的时间相关响应。有限元分析与所提出的微机械模型之间的比较显示出良好的一致性。实验测试验证了使用所提出的理论模型获得的结果。