Three-point bending properties of carbon fiber/honeycomb sandwich panels with short-fiber tissue and carbon-fiber belt interfacial toughening at different loading rate
Three-point bending properties of carbon fiber/honeycomb sandwich panels with short-fiber tissue and carbon-fiber belt interfacial toughening at different loading rate
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不同加载速率下短纤维组织和碳纤维带界面增韧碳纤维/蜂窝夹芯板的三点弯曲性能
DOI：
10.1016/j.compositesa.2021.106289
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发表时间：
2021-04
期刊：
影响因子：
--
通讯作者：
石姗姗
中科院分区：
文献类型：
--
作者：
孙直;陈红杰;宋子文;刘浩洋;崔荣华;郭旭;石姗姗
研究了芳纶短纤维组织和碳纤维带增韧碳纤维/蜂窝夹芯板在不同加载速率下的弯曲性能。碳纤维带穿过蜂窝芯的孔隙缝合以改善界面。通过不同加载速率下的三点弯曲试验，研究了芳纶短纤维组织和碳纤维带对碳纤维/蜂窝夹层结构力学性能的影响。实验结果表明，在2 ~ 500 mm/min的加载速率范围内，芳纶短纤维界面增韧和碳纤维带增韧均能提高夹层试件的能量吸收和峰值载荷。结果表明，裂纹隔离现象是避免夹层试件界面损伤的主要机制。
The bending performances at different loading rate are studied for carbon fiber/honeycomb sandwich panels toughened by short aramid fiber tissues and carbon fiber belts. The carbon fiber belts are stitched cross the pores of honeycomb core for interfacial improvements. Three-point bending tests at different loading rates are carried out to investigate the effect of short aramid fiber tissue and carbon fiber belt on mechanical properties of carbon fiber/honeycomb sandwich specimens. Experimental results firstly indicate that the short-aramid-fiber interfacial toughening and carbon fiber belts toughening could both enhance the energy absorption and peak load of sandwich specimens at loading rates ranging from 2 mm/min to 500 mm/min. The failure modes and microstructures of toughened specimens are observed to analyse and explain the underlying mechanism of enhancing effect. It is illustrated that crack isolation phenomenon is found to be the main mechanism for avoiding interfacial damage of the sandwich specimen.
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