Z-pin增强复合材料帽型单加筋板弯曲性能

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

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。

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 6.1kN 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.