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Experimental study on the low-velocity impact response of braided composite panel: Effect of stacking sequence

机译：编织复合板低速冲击响应的实验研究：堆叠序列的影响

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摘要

Braided composite laminates allow a reinforcement architecture design method of varying ply-to-ply braided structure instead of rotating fiber orientation in traditional unidirectional laminates. The stacking sequence sensitivities of braided laminates subjected to low-velocity impact were experimentally studied. Uniform ([+/- 45 degrees(6)]) and non-uniform ([+/- 30 degrees(2)/+/- 45 degrees(2)/+/- 60 degrees(2)]) architectures were designed to evaluate the effect of braided structure on impact performance. In addition, non-uniform laminate was impacted on both sides to identify the role of impact side on the failure mode. Quasi-static indentation was conducted to understand the damage initiation and propagation of braided laminates. The experimental results show that braided ply with high crimp level in impact side induced the main cracks along the load-carrying yarn, causing that the laminate failed in a kink-band dominated mode. For braided ply with low crimp level, a micro-buckling damage was found in the impact side, leading to the delamination dominated failure mode. It was also found that uniform braided laminate presents inferior impact resistance with respect to lower peak load and more concentrated damage because the kink-band can propagate into the specimen along braiding yarn easily.
机译：编织复合层压板允许增强架构设计方法改变帘布层编织结构，而不是在传统的单向层压板中旋转纤维取向。实验研究了经受低速冲击的编织层压板的堆叠序列敏感性。均匀（[+/- 45度（6）]）和不均匀（[+/- 30度（2）/ + / - 45度（2）/ + / - 60度（2）/ + / - 60度（2））架构评价编织结构对冲击性能的影响。此外，非均匀的层压板在两侧撞击以识别冲击侧对破坏模式的作用。进行了准静态压痕，以了解编织层压板的损伤启动和传播。实验结果表明，撞击侧的高压接水平的编织帘布层沿着承载纱线引起主裂缝，导致扭结占主导地位的层压板失效。对于具有低压接水平的编织帘布层，在冲击侧发现微屈曲损坏，导致分层主导的故障模式。还发现，均匀的编织层压材料具有相对于较低峰值负荷和更浓度的浓度较差的抗冲击性，因为扭结带可以容易地沿着编织纱线传播到样本中。

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