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针对复合材料帽型加筋壁板结构弯曲承载性能差的缺点,采用Z-pin增强技术提高弯曲承载性能。为研究Z-pin直径、体积分数、增强区长度对复合材料帽型加筋壁板弯曲性能的影响,制备了不同参数的Z-pin增强帽型加筋壁板试样并开展三点弯曲试验,对Z-pin增强机理及试样失效机制进行了分析。结果表明:随着体积分数的增加,由于Z-pin的桥联作用,Z-pin增强帽型加筋壁板弯曲性能提高,同时由于Z-pin植入产生的损伤增加,通过理论分析得到当Z-pin体积分数为2.6%时,弯曲峰值力达到最大值6.1kN;Z-pin直径对帽型加筋壁板弯曲峰值力影响不显著;当Z-pin增强区长度为总长度的48%时,Z-pin增强帽型加筋壁板弯曲峰值力与全部植入Z-pin时基本相当。
In view of the shortcomings of the composite cap hat stiffened wall structure bending bearing performance, using Z-pin reinforcement technology to improve the bending bearing performance. In order to study the influence of Z-pin diameter, volume fraction and reinforced zone length on the flexural properties of composite hat-capped stiffened panels, Z-pin stiffened stiffened panels with different parameters were prepared and three-point bending test , Z-pin enhancement mechanism and failure mechanism of the sample were analyzed. The results show that with the increase of volume fraction, the bending performance of Z-pin reinforced capped stiffened panels increases with the Z-pin bridging effect and the damage caused by Z-pin implant increases. When the volume fraction increases, When the volume fraction of Z-pin is 2.6%, the peak bending force reaches the maximum value of 6.1 kN. The effect of Z-pin diameter on the peak bending force of hat stiffened panel is insignificant. When the Z-pin length is 48% , The peak bending force of the Z-pin reinforced cap stiffened siding is almost equivalent to that of all Z-pin implants.