Abstract With the Carbon Fiber Reinforced Polymer (CFRP) composites widely applied in the aerospace engineering field, it is necessary to get proper understanding of shear mechanical properties under dynamic loading. Taking the experimental method, this paper studied the in-plane and interlaminar shear properties of composites using a high-speed tensile test machine at high strain rate loading. Meanwhile, quasi-static tests were carried out with a universal test machine as contrast. Digital Image Correlation (DIC) method and high-speed camera were adopted to obtain the strains and the failure process of the specimen. This paper also designed a new method on interlaminar shear tests, with the experimental design, data processing and result analysis presented. The test results show that the strain rate sensitivity of the in-plane shear properties is greater than that of the interlaminar shear properties. The empirical formulas of high strain rate effects of CFRP materials were also derived for strength and modulus prediction and furtherly instruct the development of constitutive equations at various strain rates. In addition, this paper analyzed and discussed the failure mode of specimens, and the multiple-ply cracking, fiber pulling out and delamination in the V-shaped fracture has been shown in the in-plane shear tests while the typical mode II shear failure occurred in the interlaminar tests from strain rate range of 0.001-1500 s-1.

中文翻译：

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高应变率对碳纤维增强复合材料剪切性能的影响

摘要 随着碳纤维增强聚合物（CFRP）复合材料在航空航天工程领域的广泛应用，有必要对动态载荷下的剪切力学性能有正确的认识。本文采用实验方法，利用高速拉伸试验机在高应变率载荷下研究了复合材料的面内和层间剪切性能。同时，作为对比，采用万能试验机进行准静态试验。采用数字图像相关（DIC）方法和高速相机获取试件的应变和破坏过程。本文还设计了一种新的层间剪切试验方法，并给出了试验设计、数据处理和结果分析。试验结果表明，面内剪切特性的应变率敏感性大于层间剪切特性的应变率敏感性。还推导出了 CFRP 材料高应变率效应的经验公式，用于强度和模量预测，并进一步指导了不同应变率下本构方程的发展。此外，本文还对试件的破坏模式进行了分析和讨论，面内剪切试验显示了V型断口的多层开裂、纤维拉出和分层，而典型的II型剪切破坏发生。在应变率范围为 0.001-1500 s-1 的层间测试中。还推导出了 CFRP 材料高应变率效应的经验公式，用于强度和模量预测，并进一步指导了不同应变率下本构方程的发展。此外，本文还对试件的破坏模式进行了分析和讨论，面内剪切试验显示了V型断口的多层开裂、纤维拉出和分层，而典型的II型剪切破坏发生。在应变率范围为 0.001-1500 s-1 的层间测试中。还推导出了 CFRP 材料高应变率效应的经验公式，用于强度和模量预测，并进一步指导了不同应变率下本构方程的发展。此外，本文还对试件的破坏模式进行了分析和讨论，面内剪切试验显示了V型断口的多层开裂、纤维拉出和分层，而典型的II型剪切破坏发生。在应变率范围为 0.001-1500 s-1 的层间测试中。