碳纤维复合管-铝合金胶接接头拉伸性能研究

STUDY ON TENSILE PROPERTIES OF CARBON FIBER COMPOSITE TUBE-ALUMINUM ALLOY ADHESIVE JOINT

以直径为80 mm,壁厚为1 mm的碳纤维复合管-Al合金胶接接头为研究对象,通过整体拉伸试验比较了不同胶接长度、胶层厚度、外加紧固件对接头破坏载荷的影响。结果表明:胶接面的破坏载荷随着胶接长度的增大先增大后减小,随着胶层厚度的增大而降低。随着胶接长度和厚度的增加,胶接面由复合材料分层破坏和部分胶层的剪切破坏转向胶接界面剥离破坏。在胶接面上施加紧固件能够抵消部分附加弯矩引起的剥离应力,从而提高接头的破坏载荷。胶接长度为100 mm,胶层厚度为0.01 mm^0.02 mm,施加三条非均布紧固件的胶接面能够承受最大为255 kN的破坏载荷。

The influence of bonding length,adhesive layer thickness and external tightening firmware on the failure load for a carbon fiber composite tube-aluminum alloy joint connected by adhesive were investigated through tensile tests.The results show that the failure load increases with the bonding length first but decreases from a critical bonding length,while it decreases with the adhesive layer thickness monotonously.As the bonding length and adhesive layer thickness increase,the dominant mechanism for the rupture of the joint is shifted from the failure of the composite material and partial of the adhesive layer to the failure of tube-adhesive interfacial bonding and overall adhesive layer.By applying a tightening firmware on the adhesive surface,the stripping stress caused by some additional bending moments can be cancelled,thereby the joint gets strengthened.With a bonding length of 100 mm,an adhesive layer thickness of 0.01 mm^0.02 mm and three unevenly spaced fasteners,the adhesive joint can withstand a maximum load of up to 255 kN.