Abstract The effect of ply thickness on the notch sensitivity and bearing properties on carbon fibre reinforced polymer composites and their hybrid laminates with steel foils were studied. Laminates with ply thicknesses of 0.3 mm and 0.03 mm comprising of CFRP and hybrid laminates were manufactured and characterized using tension, open hole tension and double lap bearing tests. A 25% ply substitution was found to double the bearing load with extensive plastic deformation in the joint while maintaining high stress and maintaining constant cross-sectional thickness in the laminate. With a good agreement between the finite element predicted values and failure behaviour, the damage initiation and progression behaviour could be observed experimentally. We numerically captured (i) rapid failure of 0° plies in the thin ply CFRP hybrid and (ii) continuous delamination with significant plastic deformation for the thick ply CFRP hybrid. The numerical results significantly reduce future experimental work when designing hybrid laminates and could allow the laminate lay-up to be tailored for load cases. Both the experiments and numerical models underline the distinct size effects occurring with respect to the ply thicknesses when hybridising a very ductile metal with a brittle yet strong composite material.

中文翻译：

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钢箔增强复合材料层板尺寸效应的实验和数值研究

摘要 研究了层厚度对碳纤维增强聚合物复合材料及其与钢箔混合层压板的缺口敏感性和承载性能的影响。层压板厚度为 0.3 毫米和 0.03 毫米，由 CFRP 和混合层压板组成，并使用张力、开孔张力和双搭接轴承测试进行表征。发现 25% 的层替代可以使轴承载荷加倍，并在接头中产生广泛的塑性变形，同时保持高应力并保持层压板的横截面厚度不变。由于有限元预测值和失效行为之间具有良好的一致性，可以通过实验观察损坏的开始和发展行为。我们从数值上捕获了 (i) 薄层 CFRP 混合材料中 0° 层的快速破坏和 (ii) 厚层 CFRP 混合材料的连续分层和显着塑性变形。在设计混合层压板时，数值结果显着减少了未来的实验工作，并且可以允许层压板铺层针对负载情况进行定制。实验和数值模型都强调了当将非常具有延展性的金属与脆而坚固的复合材料混合时，在层厚度方面发生的明显尺寸效应。