Progressive damage and residual strength of open-hole thin-ply CFRP laminates under tensile fatigue loading
Progressive damage and residual strength of open-hole thin-ply CFRP laminates under tensile fatigue loading
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DOI：
10.1016/j.compstruct.2023.116973
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发表时间：
2023-03
影响因子：
6.3
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中科院分区：
文献类型：
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由于其优异的抗损伤和疲劳性能，以及在复合材料结构中提高设计自由度的优点，薄层复合材料是有前途的结构材料。在这项研究中，开孔拉伸疲劳试验进行碳纤维增强聚合物层压板使用薄层铺层，以研究不同的铺层厚度的影响。对三种不同铺层厚度的准各向同性层合板（薄层、中间层和厚层）在不同应力下进行疲劳试验。利用X射线照相技术，通过评价刚度退化和内部损伤，研究了圆孔周围的疲劳损伤扩展。此外，疲劳试样进行静态拉伸试验，以评估疲劳损伤对疲劳试验后剩余强度的影响。在高应力水平下的高周疲劳下，薄层层合板可以抑制疲劳损伤扩展并保持剩余强度性能，从而验证了其优于厚层合板。
Thin-ply composites are promising structural materials because of their excellent damage resistance and fatigue properties, as well as the advantage of improved design freedom in composite structures. In this study, open-hole tensile fatigue tests were performed on carbon-fiber-reinforced polymer laminates using thin-ply prepregs to investigate the effects of varying ply thickness. Fatigue tests were performed on three types of quasi-isotropic laminates with different ply thicknesses (thin-ply, intermediate-ply, and thick-ply) at several stresses. Fatigue damage growth around a circular hole was examined by evaluating stiffness degradation and internal damage using X-ray radiography. Additionally, the fatigued specimens were subjected to static tensile tests to evaluate the effect of fatigue damage on the residual strength after fatigue tests. The thin-ply laminates can suppress fatigue damage growth and retain the residual strength properties under high-cycle fatigue at high stress level, thus validating their superiority over thick-ply laminates.