This paper investigates the effect of randomly distributed interface cohesive strength on the initiation and propagation of delamination of the REBCO tapes. A three-dimensional cohesive zone finite element model (FEM) is established with consideration of randomly distributed interface cohesive strength satisfied three-parameter Weibull distribution, which is used to analyze the influence of the randomness of interface cohesive strength on the delamination performance of tapes under transverse tensile. The simulation results show that the boundary for delamination beginning predicted by the model, considering the randomly distributed interface cohesive strength, has a random character and is closer to the actual situation. Furthermore, parameters that are important to the random Weibull distribution are also investigated. It is shown that the scale parameter and the minimum interface cohesive strength have negligible influence on the delamination strength. Meanwhile, it has a significant impact on the peak value of the stress at delamination initiation in the REBCO layer and its position. For a particular Weibull distribution, its median can be used as constant interface cohesive strength to simulate the macroscopic delamination behavior of the tapes, accurately and efficiently.

本文研究了随机分布的界面内聚强度对 REBCO 胶带分层的起始和传播的影响。建立考虑随机分布的界面结合强度满足三参数威布尔分布的三维结合区有限元模型，分析界面结合强度的随机性对胶带剥离性能的影响。横向拉伸。仿真结果表明，考虑随机分布的界面结合强度，模型预测的分层起点边界具有随机性，更接近实际情况。此外，还研究了对随机 Weibull 分布很重要的参数。结果表明，尺度参数和最小界面内聚强度对分层强度的影响可以忽略不计。同时，它对REBCO层中分层起始应力峰值及其位置有显着影响。对于特定的 Weibull 分布，其中值可用作恒定的界面内聚强度，以准确有效地模拟胶带的宏观分层行为。