Progressive Failure Analysis and Experiment Research of the Composite Bolted Connection

Abstract

Bolt connection is a common engineering structure. In order to analysis the composite bolted connection, based on continuous damage mechanics method, different failure criteria are established for fiber, matrix and delamination. To improve the efficiency of engineering estimation, this paper proposed the selective parabola algorithm to solve the fracture angle and uses the linear stiffness degradation method to establish the finite element model. Firstly, composite laminates with a hole in the tension stress are analyzed by using the above model, and by comparing the test results with the experimental results, the feasibility of the model is verified. Then, the progressive failure analysis is carried out to study the composite bolted connection. The comparison between the calculation results and the test results shows that the mechanical model proposed in this paper can predict the strength of composite bolted connection under tensile load accurately and also can present the damage evolution process exactly.