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.

研究了短芳族聚酰胺纤维组织和碳纤维带增韧的碳纤维/蜂窝夹芯板在不同加载速率下的弯曲性能。碳纤维带缝在蜂窝状芯的孔上，以改善界面。进行了在不同加载速率下的三点弯曲测试，以研究短的芳族聚酰胺纤维组织和碳纤维带对碳纤维/蜂窝夹层样品力学性能的影响。实验结果首先表明，短芳纶纤维界面增韧和碳纤维带增韧可以在2 mm / min至500 mm / min的加载速率下提高夹心试样的能量吸收和峰值载荷。观察了增韧试样的破坏模式和微观结构，以分析和解释增强作用的潜在机理。结果表明，隔离裂纹现象是避免夹层试样界面损伤的主要机理。