Pullout performance of circumferentially notched z-pins in carbon fiber reinforced laminates
Pullout performance of circumferentially notched z-pins in carbon fiber reinforced laminates
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DOI：
10.1016/j.compositesa.2018.05.002
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发表时间：
2018-07
期刊：
影响因子：
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通讯作者：
J. Hoffmann;Jakob Sabban;G. Scharr
中科院分区：
文献类型：
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作者：
J. Hoffmann;Jakob Sabban;G. Scharr
本文对碳纤维/环氧复合材料层合板中环形缺口cfrp z销的拉拔性能进行了实验研究。单向拉拔试样在体积含量为1.0%的情况下用z-销进行加固。采用四种不同的缺口深度研究了它们对拉拔过程中桥接力和耗散能的影响。与光滑的z形销相比，缺口销可以提供更高的桥接力，缺口深度最低为25 µm时最有效。脱粘力和最大摩擦力可分别提高87%和76%。由于桥接力的增强，缺口z销能够增加销拔出过程中耗散的能量。在拔销过程中，开槽对销的刚度没有影响。计算出的强度下降幅度为10-28%，这取决于销的缺口深度。
This paper presents an experimental study on the pullout performance of circumferentially notched cfrp z-pins in carbon fiber/epoxy laminates. Unidirectional pullout specimens were reinforced with z-pins at a volume content of 1.0%. Four different notch depths were used to investigate their effect on the bridging forces and the dissipated energy during pullout. Compared to smooth z-pins, notched pins were found to provide much higher bridging forces, with the lowest notch depth of 25 µm being the most effective. The debonding force and maximum friction force could be increased up to 87% and 76%, respectively. Because of the enhanced bridging forces, notched z-pins were able to increase the amount of energy that is dissipated during pin pullout. Notching the pins was found to have no influence on the stiffness of the pins during pin pullout. The calculated decrease in strength was 10–28%, depending on the notch depth of the pins.