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- 2019
有一定取向性的碳纤维增强尼龙6复合材料弹性模量的实验和理论研究
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Abstract:
纤维增强热塑性聚合物基复合材料注塑成型后往往被认为是各向同性复合材料。然而，注塑成型后纤维会具有一定的取向性，从而使复合材料试样呈现各向异性的特点。为了合理预测此类复合材料的弹性模量，本文对碳纤维增强尼龙6复合材料注塑试样内部的纤维长度和取向分布情况进行了测试和分析，得出了纤维取向的分布规律。随后结合单向纤维增强聚合物基复合材料力学模型和层叠理论，构造出了适用于有一定取向性的纤维增强树脂基复合材料弹性模量预测理论模型，其理论结果和拉伸实验结果吻合较好，表明该预测模型的准确性比较高。 The injection-molded fiber reinforced thermoplastic composites are generally considered as isotropic material. However, the fibers manifest some degree orientation after injection molding, which makes the composite sample anisotropic. In order to reasonably predict the elastic modulus of such composites, the fiber length and orientation distribution in the injection-molded carbon fiber reinforced nylon 6 composites were tested and analyzed. The distribution of fiber orientation was obtained. Subsequently, combined with the mechanic model and stacking theory of unidirectional fiber reinforced composites, the theoretical model for predicting the elastic modulus of oriented fiber reinforced polymer composites was constructed. The theoretical results agree well with the tensile test ones, indicating that the accuracy of the prediction model is relatively high
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