Simulation study on ultimate strength of CFRP-reinforced cracked stiffened panels

Abstract

[Objectives] In order to investigate the ultimate strength of CFRP-reinforced cracked stiffened panel in ship structure repair process,[Methods] in this paper,nonlinear finite element method is used to analyze the ultimate strength of CFRP-reinforced cracked stiffened panels subjected to axial compressive loads. Based on CFRP-reinforced cracked stiffened panel model,we compare the simulation results with the recorded test results,to verify the accuracy of the proposed method. By using double-side CFRP -reinforced cracked stiffened panel as the example,we study the ultimate strength of stiffened panel,and the peeling mechanism and the stress of the adhesive layer were analyzed.[Results] The results show that the ultimate strength of CFRP-reinforced cracked stiffened panels is significantly increased,and is close to the ultimate strength of stiffened panel with geometric initial defects;CFRP repairs the debonding of cracked stiffened panel after the ultimate strength is achieved.[Conclusions] The repair of the cracked stiffened panel by using CFRP can enhance the ultimate strength. It may provide guidance for the ships and offshore structure repair.

Keywords

• Carbon Fiber Reinforced Polymer(CFRP)
• craked stiffened plate
• ultimate strength
• nonlinear finite element method