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纤维残存长度及其分布是影响纤维增强聚合物基复合材料性能的重要因素之一。通过对碳纤维在纯剪切流场中的受力断裂行为分析,建立了复合材料中碳纤残存长度和重均残存长度的预测模型,并借助密炼机混合实验,对上述2个模型进行了验证。结果表明:预测结果与实验结果误差在15%以内;随着转子转速的增加,碳纤残存长度和重均残存长度减小;随着混合时间的增加,纤维受到的累积解聚功增加,碳纤残存长度和重均残存长度减小。
Fiber residual length and its distribution are one of the important factors affecting the performance of fiber reinforced polymer matrix composites. Through the analysis of the stress-strain fracture behavior of carbon fiber in the pure shear flow field, the prediction model of carbon fiber residual length and weight average residual length in the composites was established, and the above two models were verified by the mixer mixing experiment . The results show that the error between prediction and experimental results is less than 15%. With the increase of rotor rotational speed, the residual length of carbon fiber and the weight-average residual length decrease. With the increase of mixing time, the cumulative depolymerization work of fiber increases. Weight average remaining length decreases.