Mechanical properties of composite laminates reinforced with rectangular z-pins in monotonic and cyclic tension
Mechanical properties of composite laminates reinforced with rectangular z-pins in monotonic and cyclic tension
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DOI：
10.1016/j.compositesa.2018.03.004
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发表时间：
2018-06
影响因子：
8.7
通讯作者：
J. Hoffmann;G. Scharr
中科院分区：
文献类型：
--
作者：
J. Hoffmann;G. Scharr
本文介绍了一个实验研究单向和准各向同性的碳纤维/环氧树脂层压板的静态和疲劳拉伸性能的矩形和圆形z销增强。与未固定样本相比，所有z-固定层合板的拉伸刚度和强度均有所降低。观察到与层压板层的纤维方向纵向对齐的矩形z销的插入导致轻微的微观结构损伤，例如平面内纤维波纹。因此，使用矩形z销导致单向和准各向同性层压板中的显著更高的拉伸刚度和强度。无销层压板仅表现出轻微的疲劳效应。Z销的插入导致测试的单向和准各向同性层合板的疲劳性能降低。由于这种恶化主要是由Z销层压板的静态拉伸强度的初始击倒引起的，所以矩形Z销在单向和准各向同性层压板中均显示出上级的疲劳性能。
This paper presents an experimental study investigating the static and fatigue tensile properties of unidirectional and quasi-isotropic carbon fiber/epoxy laminates reinforced with rectangular and circular z-pins. All z-pinned laminates showed reduced tensile stiffness and strength compared to unpinned specimens. The insertion of rectangular z-pins that were aligned lengthwise to the fiber direction of a laminate ply was observed to cause minor microstructural damage, such as in-plane fiber waviness. Therefore, the use of rectangular z-pins led to significantly higher tensile stiffness and strength in both unidirectional and quasi-isotropic laminates. Unpinned laminates showed only minor fatigue effects. The insertion of z-pins resulted in a decrease in the fatigue performance of the tested unidirectional and quasi-isotropic laminates. Since this deterioration was primarily caused by the initial knockdown of the static tensile strength of the z-pinned laminates, rectangular z-pins showed superior fatigue performance in both unidirectional and quasi-isotropic laminates.