复合材料夹层结构T型接头连接方式的研究

STUDIES ON CONNECTION MODES OF SANDWICH COMPOSITE T-JOINTS

通过对复合材料夹层结构T型接头的三种连接方式进行研究,记录胶接、胶-缝混合连接和胶-螺混合连接在竖向荷载作用下的破坏过程和破坏模式、最大位移和极限荷载,并且研究缝合直径和缝合密度对接头极限抗剪承载力的影响。结果表明,夹层结构根部是试件破坏的薄弱部位,在结构设计时应重点考虑。胶-螺混合T型连接能明显提高夹层结构的极限抗剪承载力,但增加了接头的质量。胶-缝混合T型连接能够提高夹层结构极限抗剪承载力,且接头质量较轻,具有很好的应用前景;缝线直径和密度对承载力影响很大,可以进一步研究。

Three connection modes of sandwich composite T-joints were investigated by the experimental method. During the experiments,the failure process ,the failure modes,the maximum displacement and the ultimate load of the adhesive, adhesive ＆ stitched and adhesive ＆ bolted T-joints under vertical load were tested.In addition,effects of stitch diameter and stitch density on ultimate shear-resistant capacity were studied.The experimental results show that the root of sandwich structure represents a potential zone of weakness and it should be well considered on structure design.Adhesive ＆ bolted T-joints can obviously improve the ultimate shear-resistant capacity of sandwich structure, but it also increases the weight.Adhesive ＆ stitched T-joints can also improve the ultimate shear-resistant capacity of sandwich structure with a light weight,which has good application prospects; The influence of stitch diameter and stitch density on the shear-resistant capacity is very great,which can be further researched.