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Strength of short fiber reinforced polymers: Effect of fiber length distribution

机译：短纤维增强聚合物的强度：纤维长度分布的影响

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摘要

In this study, the prediction of mechanical strength of short fiber reinforced plastics (SFRPs) is made possible by obtaining a Fiber Length Distribution (FLD) efficiency factor, eta(FLD), from the formerly known twofold discrete strengthening equation of Kelly-Tyson. The unified parameter eta(FLD) is developed involving both the effects of fiber breakage and resulting distribution, fiber volume fraction and fiber and interface properties, so that they can be incorporated into modified rule of mixtures (MROM). This procedure helps to clarify the experimentally observed loss in strengthening rate with increasing fiber fraction. By adapting a few experimentally determined distributions to a Weibull type function, the analytical solutions described in this study establish the exploration of the strength of SFRPs in the entire fiber content range or can reveal the interfacial bond strength. After investigating the effects of fiber and interface parameters on strengthening efficiency, it is found that common fiber-matrix combinations possessing intermediate critical fiber lengths show a significant decrease in strengthening efficiency with increasing fiber content at low fiber loadings. On the contrary, higher and lower critical fiber lengths yield less significant losses.
机译：在这项研究中，通过从先前已知的凯利·泰森（Kelly-Tyson）双重离散强化方程中获得纤维长度分布（FLD）效率因子eta（FLD），可以预测短纤维增强塑料（SFRP）的机械强度。统一参数eta（FLD）的开发涉及纤维断裂和最终分布，纤维体积分数以及纤维和界面特性的影响，因此可以将它们纳入混合规则（MROM）中。该程序有助于弄清实验观察到的增强速率随纤维分数的增加而损失。通过使一些实验确定的分布适应Weibull型函数，本研究中描述的分析解决方案建立了在整个纤维含量范围内SFRP强度的探索，或者可以揭示界面粘合强度。在研究了纤维和界面参数对增强效率的影响后，发现具有中等临界纤维长度的常见纤维-基质组合在低纤维载荷下随纤维含量的增加显示出增强效率的显着降低。相反，较高和较低的临界纤维长度会产生较小的明显损失。

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