论文标题
研究体积分数对单向纤维增强复合材料内应力转移的影响的研究
A Study of the Effect of Volume Fraction on Stress Transfer within a Unidirectional Fiber Reinforced Composite Having a Broken Fiber
论文作者
论文摘要
由于任何材料中缺陷而引起的应力浓度非常危险。因此，在实际应用材料之前，它的理解非常重要。由于纤维增强复合材料（FRC）正在获得广泛的应用，因此有必要将其作为参数之一进行分析。文献调查表明，由于纤维破裂而导致的FRC失败是一个累积过程。如果纤维破坏应力浓度接近失败，从而导致其他纤维在其附近失败。这个过程一直持续到整个FRC失败为止。该现象是通过称为应力转移系数（STC）的参数来量化的。为了分析FRC，可以实践分析代表性元素（RVE），这是完整FRC的表示。分析FRC时考虑的另一个重要方面是纤维的分布。理想情况下，纤维的分布应均匀，但没有制造过程保证均匀分布。因此，在分析FRC的同时，最好用随机分布的纤维生成RVE。在本文中，试图达到量分数与STC之间的关系。考虑了具有单向纤维取向的FRC。分析具有不同体积分数的RVE。实现了一种新方法来生成带有随机分布纤维的RVE。 rves的生成是如此，以至于它在其几何中心及其周围的其他纤维中包含纤维破裂。 RVE沿着光纤方向加载。
Stress concentration due to flaws in any material are very dangerous. Its understanding is thus very important before practical application of the material. As Fiber Reinforced Composite (FRC) is gaining wide range of application it is necessary to analyze it for stress concentration as one of the parameter. Literature survey reveals that the failure of FRC due to breakage of fiber is a cumulative process. If a fiber breaks stress concentration develops near the failure which leads to failure of other fibers in its vicinity. This process continues until the whole FRC gets failed. This phenomenon is quantified by a parameter called Stress Transfer Coefficient (STC). To analyze FRC generally it is practiced to analyze Representative Volume Element (RVE) which is a representation of the complete FRC. Another important aspect which is considered while analyzing FRC is the distribution of the fiber. Ideally the distribution of fibers should be uniform but no manufacturing process guarantees uniform distribution. Thus while analyzing FRC it is a good practice to generate RVE with randomly distributed fibers. In this paper an attempt is made to attain the relationship between volume fraction and STC. FRC with unidirectional fiber orientation is considered. RVEs with different volume fraction are analyzed. A new method is implemented to generate RVE with randomly distributed fibers. RVEs are so generated that it contains a broken fiber at its geometrical center and other fibers surrounding it. The RVE is loaded along the fiber direction.
