GFRP管-铝合金管纤维缠绕齿连接接头拉伸试验
Tensile experiments on the tooth connections with filament winding between GFRP tube and aluminum alloy tube

为了实现复合材料-铝合金连接，提出了一种新型GFRP管-铝合金管纤维缠绕齿连接接头，对2组GFRP管-铝合金管缠绕齿连接接头试件进行了拉伸试验，观察了试件的受力过程和破坏形态，获得了荷载-位移曲线和荷载-轴向应变曲线，同时利用有限元模型分析了GFRP管-铝合金管缠绕齿连接接头拉伸作用下的破坏机制。结果表明：接头试件的破坏模式为GFRP管齿的逐齿剪切破坏，破坏过程表现出延性特征并产生较大的轴向位移，试件对应GFRP管的平均极限拉应力为213.22 MPa；接头依靠齿的层间抗剪传递轴力，GFRP管齿是接头受力的薄弱部位，且各齿承受不均的荷载分配；齿的破坏始于齿根的角点处。 In order to obtain a new way of connection between composite material and aluminum-alloy, the tooth connection between GFRP tube and aluminum-alloy tube with filament winding was proposed. The tensile experiments on two-group specimens of the tooth connect between GFRP tube and aluminum alloy tubes were conducted. The failure model, load-displacement relationship and load-axial strain relationship were documented during the loading process. The failure mechanism of the tooth connection between GFRP tube and aluminum-alloy tube subject to tension was numerically explored. The results show that the failure model for specimen of the connection is one-by-one shear failure of GFRP tube teeth, the failure process appears the ductility feature and larger axial displacement, and the average ultimate tensile stress of GFRP tube is 213.22 MPa; the connection carries the axial force through interlaminar shear of the teeth, the teeth of GFRP tube is the weak part when the connection was stressed and different teeth endure different load distribution; the failure of teeth originate from the angular point of the root of teeth. 国家重点研发计划（2017YFC0703008）；国家自然科学基金（51778620）；中国博士后科学基金（2017M611657）