Influences of interface bonding behavior on the arresting performance of CFRP buckle arrestors - Part II: Analysis

• Dedicated 3 D FE models are developed to reproduce the process of buckling and its evolution. • Surface-based cohesive behavior is used to describe the interface bonding performance between the pipe and CFRP arrestor. • The parametric analyses on the crossover pressure are numerically conducted. • Improved empirical formulas are proposed to estimate the crossover pressure and arresting efficiency of CFRP arrestors. The CFRP buckle arrestor, designed as an innovative arresting device, effectively enhances the local circumferential stiffness of subsea pipes, serving as a barrier to prevent the spread of buckling. This arrestor consists of multiple layers of adhesive and CFRP, carefully wound around the subsea pipes in several loops. In the present work, a fully-coupled nonlinear finite element (FE) model is proposed to simulate the collapse and its evolution of tubes wrapped with CFRP arrestors, which is verified by the previous experimental results. The interface bonding performance between tubes and CFRP arrestors is characterized by the surface-based cohesive behavior in ABAQUS, and the circumferential, axial, and normal bonding behavior is defined according to the measured bonding strength and slip. The failure mechanism at the interface between the tubes and CFRP arrestors is revealed. Subsequently, broad parametric analyses are numerically performed, covering key geometric and material parameters as well as interface bonding properties. Finally, based on the extensive FE results, optimized empirical formulas are established to assess the crossover pressure and arresting efficiency of CFRP buckle arrestors under flattening-mode.