Pull-out performance of rectangular z-pins in hot-cured carbon fiber reinforced laminates
Pull-out performance of rectangular z-pins in hot-cured carbon fiber reinforced laminates
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DOI：
10.1016/j.compstruct.2017.11.080
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发表时间：
2018-02
影响因子：
6.3
通讯作者：
J. Hoffmann;G. Scharr
中科院分区：
文献类型：
--
作者：
J. Hoffmann;G. Scharr
本文对热固化碳纤维/环氧树脂层合板中圆形和矩形Z销的拔出性能进行了实验研究。两种不同铺层顺序（单向和准各向同性）的拔出试样用z-pin加固，以4 × 4的图案排列，体积含量为2.0%。矩形z销被发现提供更高的桥接力在单向和准各向同性层压板。由于这种增强不能仅仅归因于矩形z针提供的更大表面积，因此使用光学显微镜来研究z针和周围层压板之间的界面。结果表明，在固化后的冷却期后的脱粘行为的变化导致更高的可实现的剪切应力内的引脚/层压板接口，从而，在引脚拔出期间的上级桥接负载。
This paper presents an experimental study on the pull-out performance of circular and rectangular z-pins in hot-cured carbon fiber/epoxy laminates. Pull-out specimens with two different ply stacking sequences (unidirectional and quasi-isotropic) were reinforced with z-pins, arranged in a 4 × 4 pattern and a volume content of 2.0%. Rectangular z-pins were found to provide much higher bridging forces in both unidirectional and quasi-isotropic laminates. Since this enhancement cannot be solely attributed to the larger surface area provided by the rectangular z-pins, optical microscopy was used to investigate the interface between the z-pins and the surrounding laminate. Results showed that a change in the debonding behavior after the post-curing cool-down period leads to higher achievable shear stresses within the pin/laminate interface, and thereby, to superior bridging loads during pin pull-out.