A hybrid composite material was obtained by stacking carbon fiber reinforced plastic (CFRP) onto 7075‐W Al alloy sheet. Mechanical properties of the CFRP/Al hybrid composite material were measured by tensile and flexural tests. To investigate the flow of the epoxy, the thinning was measured using an optical microscope and the defects were observed by a scanning electron microscope. A finite element model was established to predict the thickness and the contact pressure distributions of the CFRP/Al hybrid composite material during the forming process. The results showed that the tensile strength (TS) of the CFRP/Al hybrid composite was increased by 10% and the fracture strain was increased by 24% compared with the single 7075 Al alloy. The flexural strength (FS) and the displacement of the loading nose were improved by 13% and 75%, respectively. According to the microstructure observation, large cracks in the epoxy could be found on the side wall of the U shape part. The results of numerical analysis indicated that the low contact pressure at side wall was the main reason for the decrease of the tensile and FS and the delamination between laminates.

中文翻译：

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7075-W铝合金与碳纤维增强塑料复合材料新工艺的实验与数值研究

通过将碳纤维增强塑料（CFRP）堆叠到7075-W铝合金板上获得杂化复合材料。CFRP / Al杂化复合材料的机械性能通过拉伸和弯曲测试进行了测量。为了研究环氧树脂的流动性，使用光学显微镜测量稀释度，并通过扫描电子显微镜观察缺陷。建立了有限元模型来预测成形过程中CFRP / Al杂化复合材料的厚度和接触压力分布。结果表明，与单一7075 Al合金相比，CFRP / Al杂化复合材料的拉伸强度（TS）提高了10％，断裂应变提高了24％。弯曲强度（FS）和加载鼻的位移分别提高了13％和75％。根据显微组织观察，在U形部件的侧壁上可以发现环氧树脂中的大裂纹。数值分析结果表明，侧壁的低接触压力是导致拉伸强度和FS降低以及层合板之间分层的主要原因。