Abstract: The CFRP (carbon fiber reinforced polymer) tube is used to control the axial load bearing capacity of the CFRP (carbon fiber reinforced polymer) pipe, and the CFRP laminates are reinforced with the metal reinforcing hoop-metal end cap and the carbon fiber-metal lining reinforcement. The stress test and the failure form of the specimen are obtained by axial compression test. Based on the Hashin failure criterion, the finite element model was used to analyze the failure mode and bearing capacity of the CFRP pipe under the two end enhancement modes, and the enhancement mechanism was explained. The results show that the end enhancement can change the failure mode of the specimen and increase the bearing capacity compared with the specimen with no end reinforcement. When the end is strengthened, the external reinforcement stiffness should not be too large, and the reinforcement and the specimen are larger. The difference in stiffness will lead to inconsistent deformation, easy to occur at the edge of the enhanced edge of the shear damage. The use of carbon fiber-metal as the enhanced way of the end can effectively prevent the end of the "flowering" damage and shear damage. The overall bearing damage and axial load capacity increased by 46.37%.

Key words: CFRP tube, axial compression test, end constraints, failure mode, reinforced mechanism