Effects of ply thickness and 0°-layer ratio on failure mechanism of open-hole and filled-hole tensile tests of thin-ply composite laminates
Effects of ply thickness and 0°-layer ratio on failure mechanism of open-hole and filled-hole tensile tests of thin-ply composite laminates
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DOI：
10.1016/j.compstruct.2021.114926
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发表时间：
2021-12-06
影响因子：
6.3
通讯作者：
Ogasawara, Toshio
中科院分区：
文献类型：
--
作者：
Aoki, Ryoma;Higuchi, Ryo;Ogasawara, Toshio
薄铺层技术为复合材料结构提供了越来越多的可能性，扩大了铺层厚度和层压的设计空间。研究了铺层厚度和0度铺层比对复合材料层合板强度和损伤行为的影响。对不同铺层厚度和0度层数比的层合板进行了开孔拉伸(OHT)和填充孔拉伸(FHT)试验，通过X射线照相观察其内部损伤情况。结果表明，薄层材料的损伤延迟效应降低了OHT和FHT强度。结果还表明，0度层比越大，层合板的强度越高，0度层比越大，层合板的破坏越向劈裂为主。紧固件约束的有限元分析表明，紧固件约束缓解了孔周围0度层的应力集中，可能导致OHT和FHT强度的差异。
Thin-ply technology provides increasing possibilities for composite structures, expanding the design space for ply thickness and laminate layup. This study examines the effects of ply thickness and the 0 degrees-layer ratio on the strength and damage behavior of thin-ply composite laminates. We conducted open-hole tensile (OHT) and filled-hole tensile (FHT) tests on laminates with various ply thicknesses and 0 degrees-layer ratios, observing the internal damage via X-ray radiography. It was confirmed that the damage retardation effect of the thin-ply reduced both the OHT and FHT strengths. Furthermore, the results revealed that laminates with a higher 0 degrees-layer ratio have higher strengths and the failure of laminates with a higher 0 degrees-layer ratio transitioned to splitting-dominated failure. Finite element analysis of the fastener restraint indicated that the fastener restraint alleviated the stress concentration in the 0 degrees-layer around the hole, potentially leading to a difference in the OHT and FHT strengths.