Z-pin增强复合材料帽型单加筋板弯曲性能

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6.1 kN；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。

Bending performance of composite single hat stiffener wall structure reinforced by Z-pin

The Z-pin reinforcing technology is used to improve the less good bending bearing performance of composite hat stiffener wall structure. In order to study the influence of Z-pin volume fraction, Z-pin diameter and Z-pin reinforcing region length on the performance of hat stiffener wall structure polymer composites, the samples reinforced by Z-pin with different parameters are prepared and tested under three-point bending load. The Z-pin reinforcing mechanism and samples' failure mechanism are analyzed. The results show that the bending property of hat stiffener wall structures reinforced by Z-pin is improved with the increase of Z-pin volume fraction due to the bridging role of Z-pin, and the damage caused by Z-pin inserting increases. When the volume fraction of Z-pin is 2.6%, the bending peak load reaches the maximum value 6.1 kN through theoretical analysis. The effect of the diameter of Z-pin on the bending load of stiffener wall structures is not obvious. When the length of the Z-pin reinforcing region is 48% of the total length, the bending peak load of hat stiffener wall structure reinforced by Z-pin equals the bending peak load of samples with 100% Z-pin inserting length.