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Increased breaking strain of carbon fiber-reinforced plastic and steel hybrid laminate composites

机译:碳纤维增强的塑料和钢混合层压复合材料的断裂应变增加

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Synergistic effects of carbon fiber-reinforced plastic (CFRP) and steel hybrid laminate composites were investigated systematically by static and dynamic tensile testing. Various hybrid laminate composites were prepared by varying the adhesion between the CFRP and steel, the layup sequence, and the volume fraction of the CRFP. The fracture strain of the CFRP within the hybrid laminate composites increased, e.g., from 1.94% for pure CFRPs to 2.21% for the steel/CFRP/steel case. Finite element analysis and fractography established that transverse compressive stress was the main source of the improvement. Different Poisson's ratios led to transverse compressive stress on the CFRP layer after yielding of the steel during the tensile test. This stress delayed the fiber-splitting behavior of the CFRP, leading to further deformation and thus increasing the breaking strain and tensile strength of the CFRP within the hybrid laminate composites. Our results provide insight into the design of ductile composites using CFRP and steel through optimization of the laminate structure.
机译:通过静态和动态拉伸试验系统地研究了碳纤维增强塑料(CFRP)和钢杂化层压复合材料的协同效应。通过改变CFRP与钢之间的粘合力,铺层顺序和CRFP的体积分数,可以制备各种杂化层压复合材料。混杂层压复合材料中CFRP的断裂应变增加了,例如,从纯CFRP的1.94%增加到钢/ CFRP /钢壳的2.21%。有限元分析和断裂分析表明,横向压缩应力是改善的主要来源。在拉伸试验期间,钢屈服后,不同的泊松比会导致CFRP层产生横向压缩应力。该应力延迟了CFRP的纤维分裂行为,导致进一步变形,从而增加了杂化层压复合材料中CFRP的断裂应变和拉伸强度。我们的结果通过优化层压板结构,提供了对使用CFRP和钢的韧性复合材料设计的见解。

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