碳纤维支杆与金属接头两种连接方式的拉伸试验

TENSILE TEST FOR TWO KINDS OF JOINTS BETWEEN CARBON FABRIC ROD AND METAL END

碳纤维支杆与金属接头的连接方式通常有两种:胶接和胶-销连接。为了比较二者连接强度的大小,根据当前需求,设计并制作了拉伸试样,然后利用试验机对试样进行了拉伸试验。试验结果表明,胶接方式所能承受的最大拉伸载荷为42.25kN,连接强度为5.83MPa;胶-销连接方式所能承受的最大拉伸载荷为42.10kN,连接强度为5.81MPa。与胶接相比,胶-销连接对支杆和接头的连接强度没有较明显的提升,反而略有下降。

At present ,truss structures are used in most of the space camera structure. Generally, truss structures are composed of benches, truss rods and ends. Most of truss rods are made of carbon fabric composites, and most of ends are made of metal. There are two kinds of modes of joints between carbon fabric rod and metal end ： bonded joints and bonded-pinned joints. In order to compare the strength of the joint between bonded joints and bonded-pinned joints, two kinds of tensile samples are designed and manufactured based on current requirements. Then, tensile test was done. The results show that： the maximum tensile load that bonded joints can bear was 42.25kN, joints strength was 5.83MPa; the maximum tensile load that bonded-pinned joints can bear was 42. 10kN, joints strength was 5.81MPa. Compared to bonded joints, bonded-pinned joints did not distinctly increase joints strength, but the strength was reduced merely. Test results lay the foundation for subsequent research.