沿厚度方向的平均层板数和层板宽度对非连续纤维复合材料力学性能的影响
Effects of Average Number of Platelets Through the Thickness and Platelet Width on the Mechanical Properties of Discontinuous Fiber Composites
摘要：
在这项研究中，我们的实验和数值模拟研究的拉伸材料性能的不连续纤维复合材料（DFCs）的血小板通过厚度为两个不同的血小板宽度的平均数量增加的演变。结果表明，片晶数目和片晶宽度对复合材料的拉伸模量和强度均有显著影响。我们发现，不仅平均力学性能，但它们的变异系数的变化，根据不同的DFC介观结构。为了了解材料的细观形态和相应的材料性能之间的关系，我们开发了一个随机的血小板细观结构生成算法结合显式有限元模型。利用计算工具，我们发现，模量和强度增加的血小板通过厚度的平均数量。增加的趋势继续，直到达到渐近极限，对于窄片晶在厚度上为约45层，对于正方形片晶为27层。在这项研究中，我们解决的重要性，有准确的模拟的介观结构，以匹配不仅是平均模量和强度，而且其相关的变异系数。我们表明，它是可以准确地预测的拉伸材料性能的DFC，包括其B-基础的设计值。这是在结构应用中采用DFC的典型条件。
英文摘要：
In this study, we experimentally and numerically investigate the evolution of the tensile material properties of Discontinuous Fiber Composites (DFCs) with an increasing average number of platelets through the thickness for two different platelet widths. The results show that both the number of platelets and the platelet width have significant effects on the tensile modulus and strength. We find that not only the average mechanical properties but also their coefficients of variation change according to the different DFC mesostructures. To understand the relationship between material morphology at the mesoscale and corresponding material properties, we developed a random platelet mesostructure generation algorithm combined with explicit finite element models. Leveraging the computational tools, we find that moduli and strength increase with increasing average number of platelets through the thickness. The increasing trend continues until reaching an asymptotic limit at about 45 layers through the thickness for the narrow platelets and 27 layers for the square platelets. In the study, we address the importance of having accurate simulations of the mesostructure to match not only the average modulus and strength but also their associated coefficients of variation. We show that it is possible to accurately predict the tensile material properties of DFCs, including their B-basis design values. This is a quintessential condition for the adoption of DFCs in structural applications.
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