Numerical Simulation Of Interlayer Delamination Behavior Of REBCO High Temperature Tapes Under Mechanical And Electromagnetic Forces

The second generation(2G)high temperature superconducting(HTS)tapes,represented by Earth-Barium-Copper-Oxide(REBCO)coated conductors,have become a hot issue and the developing direction for the future in the field of superconducting science and technology due to high critical magnetic field,current density,and high critical temperature of superconducting state realized in the liquid nitrogen environment,and REBCO coated conductors show attractive potential in the fields of modern high-tech science and technology such as transportation,energy and medical treatment.As a laminated electromagnetic functional composite material,however,the delamination failure,especially,the mechanical properties seriously affect its superconductivity and application in electromagnetic thermal multifield environment.In this paper,the mechanical failure behavior of interlaminar delamination of REBCO coated conductor HTS tapes was numerically studied.Based on the bilinear cohesive zone model(CZM),a delamination finite element model(FEM)of a REBCO coated conductor tape under force-electromagnetic multi-field was constructed.The stress distribution and interface damage behavior of REBCO coated conductor tape under transverse mechanical tensile load and electromagnetic force were simulated,and the effect of electromagnetic field on interfacial failure behavior of REBCO coated conductor tape was preliminarily revealed.Firstly,the rationality of the finite element model is verified.The results showed that the results obtained from the FEM were in good agreement with the existing calculation results,and the model could accurately simulate the delamination behavior of superconducting tapes.Furthermore,the delamination behavior of superconducting tapes under transverse mechanical tension load was numerically simulated based on the FEM.The results showed that the cohesive interface had a significant effect on the stress distribution along the thickness direction,and the thickness of superconducting layer and copper layer had insignificant influence on the equivalent delamination strength of the tape.Finally,the delamination behavior of superconducting tape under electromagnetic force was numerically simulated based on the FEM.The results showed that the magnitude and direction of electromagnetic force had a significant effect on tape delamination behavior,with the increase of the contribution of electromagnetic force to delamination behavior of REBCO coated conductor tape the tape equivalent delamination strength gradually decreased,which was different from the uniform load acting on the tape surface and equivalent to the electromagnetic force.