Kevlar布层间及钢板单搭接黏结性能的试验研究

Experimental Study on Bonding Performance of Kevlar Interlayer and Kevlar-steel Single-lap Shear Joints

为了研究Kevlar纤维布层间以及纤维布与钢板单搭接的黏结性能,利用MTS微机控制电子万能试验机,分别对双层Kevlar 49纤维布和Kevlar 49纤维布/钢板单搭接剪切接头的力学性能进行测试.结果表明,双层Kevlar 49纤维布、Kevlar 49纤维布/钢板单搭接剪切接头试样的有效黏结长度分别为25mm和50mm.在有效黏结长度范围内,两种单搭接接头的黏结力均随着黏结长度的增加而增加,但增加幅度逐渐减小,当达到有效黏结长度时,黏结力达到最大值;黏结应力随着黏结长度的增加逐渐降低.本研究结果为土木工程结构补强所用Kevlar纤维布的合理黏结长度提供参考数据.

In order to investigate the bonding performance of Kevlar fabric layers and that between Kevlar fabric and steel plate,an MTS universal testing machine was used to test the mechanical properties of double-layer Kevlar 49 fabric and Kevlar 49 fabric/steel single-lap shear joints.The results show that the effective bond length of double-layer Kevlar 49 fabric single-lap shear i〇int that of Kevlar 49 fabric/steel single-lap shear joint specimens is 50 mm.Within the effective bond length,bond forces of two types of single-lap shear joints increase with the increasing bond amplitude decreases.The bond force reaches the maximum when the specimens have the effective bond length.However,the bond stresses reduce with increasing bond lengths.The experimental results obtained in this study will provide valid data for determining reasonable bond length offor structural reinforcement in civil engineering.