Coupon scale Z-pinned IM7/8552 delamination tests under dynamic loading
Coupon scale Z-pinned IM7/8552 delamination tests under dynamic loading
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DOI：
10.1016/j.compositesa.2019.105565
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
H. Cui;Yusuf Mahadik;S. Hallett;I. Partridge;G. Allegri;S. Ponnusami;N. Petrinic
中科院分区：
文献类型：
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作者：
H. Cui;Yusuf Mahadik;S. Hallett;I. Partridge;G. Allegri;S. Ponnusami;N. Petrinic
复合材料层合结构的动态冲击会导致大规模的脱层破坏。这可以通过引入全厚度加强件（例如z销）来缓解。在这里，模式I和II和混合模式的分层试验已被设计和进行高加载速率下，无论是unpinned和Z-pinned试样，以研究加载速率的影响。结果发现，Z-销在延迟动态裂纹萌生或抵抗小于5 mm的脱层的动态扩展方面无效。然而，裂纹的进一步增长大大延迟Z-钉扎，特别是对于纯模式I和模式I为主的失效模式。另一方面，Z销在剪切试验中的有效性相对较低。研究发现，Z型钉扎层合板的I型脱层阻力对加载速率敏感。
Dynamic impact onto laminated composite structures can lead to large-scale delamination. This can be mitigated by the introduction of through-thickness reinforcement, such as z-pins. Here, mode I & II and mixed-mode delamination tests have been designed and conducted at high loading rate, for both unpinned and Z-pinned coupons to study the effect of rate of loading. It was found that the Z-pins were not effective in delaying the dynamic crack initiation or resisting the dynamic propagation of delaminations shorter than 5 mm. However, the further growth of cracks was substantially delayed by Z-pinning, especially for the pure mode I and mode I dominated failure modes. On the other hand, the effectiveness of Z-pins in shear tests was relatively modest. The mode I dominated delamination resistance of Z-pinned laminates was found to be sensitive to the loading rate.