Hybrid fiber composites offer designers a means of tailoring the stress–strain behavior of lightweight materials used in high-performance structures. While the longitudinal stress–strain behavior of unidirectional hybrid fiber composites has been thoroughly evaluated experimentally and analytically, relatively little information is available on the transverse behavior. The objective of the current investigation is to present data on the transverse modulus of elasticity of unidirectional composites with five different ratios of carbon and glass fiber and to compare the data with predictive and fitted models. The transverse modulus increases monotonically with the proportion of glass fiber in the composite. Finite element analysis was used to evaluate different ways to model voids in the matrix and allowed the unknown transverse properties of the carbon fibers to be backed out using experimental data from the all-carbon composite. The finite element results show that the transverse modulus can be accurately modeled if voids are modeled explicitly in the matrix region and if modulus is calculated based on stress applied along the minimum interfiber distance path between adjacent fibers arranged in a rectangular array. The transverse modulus was under-predicted by the iso-stress model and was well predicted by a modified iso-stress model and a modified Halpin–Tsai model.

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碳/玻璃混合纤维复合材料的横向杨氏模量

混合纤维复合材料为设计师提供了一种定制高性能结构中使用的轻质材料的应力应变行为的方法。虽然单向混合纤维复合材料的纵向应力应变行为已经通过实验和分析进行了彻底的评估，但关于横向行为的信息相对较少。当前调查的目的是提供有关具有五种不同碳纤维和玻璃纤维比率的单向复合材料的横向弹性模量的数据，并将数据与预测模型和拟合模型进行比较。横向模量随着复合材料中玻璃纤维的比例单调增加。有限元分析用于评估模拟基体中空隙的不同方法，并允许使用来自全碳复合材料的实验数据消除碳纤维的未知横向特性。有限元结果表明，如果在基体区域中对空隙进行明确建模，并且如果基于沿矩形阵列中相邻纤维之间的最小纤维间距离路径施加的应力计算模量，则可以准确地对横向模量进行建模。横向模量被等应力模型低估，并且被修改的等应力模型和修改的 Halpin-Tsai 模型很好地预测。有限元结果表明，如果在基体区域中对空隙进行明确建模，并且如果基于沿矩形阵列中相邻纤维之间的最小纤维间距离路径施加的应力计算模量，则可以准确地对横向模量进行建模。横向模量被等应力模型低估，并且被修改的等应力模型和修改的 Halpin-Tsai 模型很好地预测。有限元结果表明，如果在基体区域中对空隙进行明确建模，并且如果基于沿矩形阵列中相邻纤维之间的最小纤维间距离路径施加的应力计算模量，则可以准确地对横向模量进行建模。横向模量被等应力模型低估，并且被修改的等应力模型和修改的 Halpin-Tsai 模型很好地预测。