Numerical simulation of damage in single-lap and bridge joints of superconducting tapes based on peridynamics

Abstract

Due to the limitations of the manufacturing process, the maximum length of REBCO tapes is often limited. REBCO tapes need to be connected to achieve the necessary length for the requirements of superconducting magnets. As a crucial connection element, superconducting joint plays an indispensable role in the construction of superconducting devices. However, it is worth noting that the welded joints often become the weak points of the structure, prone to damage or fracture under external loads. Given the significant advantages of the peridynamic method in handling discontinuities and fracture problems, especially its high accuracy in simulating the complex process of crack initiation and propagation, we have adopted this method to conduct in-depth research on the damage behavior of single-lap joints of REBCO tapes under mechanical loads such as tension, bending. Due to the remarkable dimensional differences of REBCO tape, 3D model of single-lap joint may lead to a large computational burden. In this paper, the peridynamic model of the laminate is used to model the REBCO tapes to improve the computational efficiency. Through this approach, the performance of single-lap and bridge joints in practical applications can be evaluated, providing valuable references for the design and manufacturing of superconducting devices.