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首页> 外文期刊>Experimental Techniques >Determining the Flexural and Shear Moduli of Fiber-Reinforced Polymer Composites Using Three-Dimensional Digital Image Correlation
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Determining the Flexural and Shear Moduli of Fiber-Reinforced Polymer Composites Using Three-Dimensional Digital Image Correlation

机译：使用三维数字图像相关性确定纤维增强聚合物复合材料的弯曲模量和剪切模量

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摘要

A three-dimensional digital image correlation system was implemented into the flexural tests of fiber-reinforced polymer composite beams to characterize shear deformation. An optimization routine that minimized the error between the analytical and experimental data was implemented with first-order shear deformation beam theory used to compute the flexural and shear moduli using the deflection and slope of the mid-plane of the beam. A relatively coarse 814 g/m(2) woven roving E-glass fabric and a rubber-toughened vinyl ester resin system were used to fabricate the 10.0mmthick laminates in a quasi-isotropic laminate configuration. Span-to-thickness ratios of 8, 12, 16, and 24-to-1 were adopted for the laminate beams at a width-to-thickness ratio of 1.5-to-1. The full-field displacement and slope-optimization fitting methods were compared with conventional discrete point methods to determine flexural and shear moduli. Slope optimization produced consistent and reasonable values for the flexural modulus at all span-to-thickness ratios but produced higher than expected values for the shear modulus at shorter spans. Deflection optimization produced more variability in the flexural and shear moduli than slope optimization and lower than expected values of shear modulus at larger span-to-thickness ratios. Tests that used higher resolution images produced slightly larger values for shear modulus. Overall, the slope-optimization method produced the least amount of variability in the results for the flexural and shear moduli.
机译：在纤维增强的聚合物复合材料梁的弯曲试验中采用了三维数字图像关联系统，以表征剪切变形。利用一阶剪切变形梁理论实现了一种优化例程，该例程使分析数据与实验数据之间的误差最小化，该理论使用梁中平面的挠度和斜率来计算弯曲模量和剪切模量。相对较粗的814 g / m（2）机织粗纱E型玻璃纤维织物和橡胶增韧的乙烯基酯树脂体系用于制造准各向同性层压板构造的10.0mm厚层压板。层压梁的跨度与厚度之比为8、12、16和24：1，宽度与厚度之比为1.5：1。将全场位移和坡度优化拟合方法与常规离散点方法进行比较，以确定弯曲模量和剪切模量。斜率优化在所有跨度-厚度比下均产生一致且合理的挠曲模量值，但在较短跨度时产生的剪切模量值高于预期值。与斜率优化相比，挠度优化在挠曲模量和剪切模量方面具有更大的可变性，并且在较大的跨层厚度比下，其剪切模量值低于预期。使用较高分辨率图像的测试产生的剪切模量值稍大。总的来说，在弯曲模量和剪切模量的结果中，斜率优化方法产生的变化量最小。

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