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The effect of strain rate and fibre content on the Poisson's ratio of glass/epoxy composites

机译：应变速率和纤维含量对玻璃/环氧树脂复合材料的泊松比的影响

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The utilization of composite materials in structural applications has prompted the need for a full characterization of their behavior under dynamic loading conditions. The rate effects of most unfilled polymers can be described by the Eyring theory of viscosity which assumes that the deformation of a polymer involves the motion of a chain molecule over potential energy barriers. The Eyring model suggests that yield stress varies linearly with the logarithm of strain rate. In the present study, tensile test were performed on a glass epoxy laminate at different rates of strain to determine the effects of strain rate on the Poisson's ratio of the materials. In additions, further tests were conducted at varying fibre contents to verify the relationship between fibre content and Poisson's ratio. The findings from the experimental results suggest that Poisson's ratio is not sensitive to strain rate. In addition, it was suggested that the absence of rate sensitivity in the poisson's ratio of the laminates tested is due to the presence of fibres in the composites.
机译：复合材料在结构应用中的利用促使人们需要全面表征其在动态载荷条件下的性能。大多数未填充的聚合物的速率效应可以通过粘度的艾林理论来描述，该理论假定聚合物的变形涉及链分子在势能垒上的运动。 Eyring模型表明，屈服应力与应变率的对数呈线性关系。在本研究中，对玻璃环氧层压板在不同的应变速率下进行了拉伸试验，以确定应变速率对材料的泊松比的影响。另外，在不同的纤维含量下进行了进一步的测试，以验证纤维含量和泊松比之间的关系。实验结果表明，泊松比对应变率不敏感。另外，建议测试的层压材料的泊松比中没有速率敏感性，这是由于复合材料中存在纤维。

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