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Elastic properties of injection molded short glass fiber reinforced thermoplastic composites

机译：注塑式短玻璃纤维增​​强热塑性复合材料的弹性性能

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摘要

Depending on fiber size and volume fraction, polymer matrix type, processing temperature, injection speed, etc., short fiber reinforced composites produced by injection molding may exhibit complex fiber concentration, orientation and length distributions at different locations, causing large variations in their mechanical properties. In this work, a representative volume element (RVE) scheme is developed to describe the elastic properties of short glass fiber reinforced PA6,6 composites produced by injection molding. In the RVE formulation, fiber length is assumed to follow a two-parameter Weibull distribution, and a new concept, namely preferential angle, is introduced to account for the preferential alignment of fibers at different locations of injection molded composites. A random sequential insertion algorithm is developed to implement the fiber length distribution and fiber preferential alignment, and finite element method (FEM) is employed to analyze the relations of the elastic properties of RVE with three parameters, that is, the mean length, volume fraction and preferential angle of the fibers. Based on the FEM results, quantitative formulas for these relations are obtained. It is found that the variations in the mean length, volume fraction, and preferential angle of the fibers can cause large variations in elastic moduli and elastic anisotropy of the RVE.
机译：取决于纤维尺寸和体积分数，聚合物基质型，加工温度，注射速度等，通过注塑生产的短纤维增强复合材料可以表现出不同位置的复杂纤维浓度，取向和长度分布，导致其机械性能大的变化。在这项工作中，开发了一种代表性体积元素（RVE）方案来描述通过注射成型产生的短玻璃纤维增​​强PA6,6复合材料的弹性性能。在RVE制剂中，假设纤维长度遵循双参数Weibull分布，并引入了新的概念，即优惠角度，以考虑纤维在注射成型复合材料的不同位置的优先对准。开发了随机顺序插入算法以实现光纤长度分布和光纤优先对准，并且采用有限元方法（FEM）来分析RVE与三个参数的弹性性质的关系，即平均长度，体积分数和纤维的优先角度。基于有限元素结果，获得了这些关系的定量公式。结果发现，平均长度，体积分数和纤维的优先角度的变化会导致rve的弹性模和弹性各向异性的大变化。

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