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首页> 外文期刊>Journal of Composite Materials >Evaluation of porosity effects on the mechanical properties of carbon fiber-reinforced plastic unidirectional laminates by X-ray computed tomography and mechanical testing
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Evaluation of porosity effects on the mechanical properties of carbon fiber-reinforced plastic unidirectional laminates by X-ray computed tomography and mechanical testing

机译：通过X射线计算机断层扫描和力学测试评估孔隙率对碳纤维增强塑料单向层压板力学性能的影响

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摘要

The effects of porosity on the matrix-dominated mechanical properties of unidirectional carbon fiber-reinforced plastic composites were evaluated using X-ray computed tomography and mechanical testing. Carbon fiber-reinforced plastic plates of four porosity levels were manufactured by implementing different curing cycles. Porosity was detected by X-ray computed tomography tests, conducted on samples taken from the plates, and quantified by analyzing the computed tomography scans using the VGStudio Max software. Four different types of mechanical tests were conducted; namely, transverse tension, V-notched rail shear, three-point bending, and short-beam shear tests. The porosity analysis showed that with increasing the porosity volume fraction, the number of pores decreases, their volume increases while their shape changes from spherical or ellipsoidal to a needle-shape. The results from mechanical tests reveal that the presence of pores reduces all matrix-dominated material properties of the UniDirectional (UD) carbon fiber-reinforced plastic material. The reduction in strength is greater than the reduction in the elastic properties. Moreover, the reduction in the in-plane shear and interlaminar properties is greater than the tensile properties of the UD carbon fiber-reinforced plastic material. Between porosity contents of similar volume fraction, the one with the few large pores proved more severe than the one with the many small pores. The large standard deviation observed for some of the tests is attributed to the non-uniform dispersion of pores.
机译：孔隙度对单向碳纤维增强塑料复合材料基体主导的力学性能的影响使用X射线计算机断层扫描和力学测试进行了评估。通过实施不同的固化循环来制造具有四个孔隙率水平的碳纤维增强塑料板。通过X射线计算机断层扫描测试检测孔隙度，对从板中取出的样品进行测试，然后使用VGStudio Max软件分析计算机断层扫描扫描进行定量。进行了四种不同类型的机械测试。即横向拉伸，V型槽钢剪切，三点弯曲和短梁剪切测试。孔隙率分析表明，随着孔隙体积分数的增加，孔的数量减少，孔的体积增加，而孔的形状从球形或椭圆形变为针状。机械测试的结果表明，孔的存在降低了UniDirectional（UD）碳纤维增强塑料材料的所有基体主导的材料性能。强度的降低大于弹性性能的降低。而且，面内剪切和层间性能的降低大于UD碳纤维增强的塑料材料的拉伸性能。在体积分数相似的孔隙率含量之间，孔隙少的孔隙比孔隙少的孔隙更为严重。在某些测试中观察到的大标准偏差归因于孔的不均匀分散。

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