Abstract
The interlayer stress transfer mechanism is the key to understand the delamination behaviour and determine the shear strength of multilayer composite superconducting tapes. Besides, it helps understanding the strain state of the superconducting material layer and further predicting its transport properties. In this paper, a theoretical model is established to investigate the stress transfer mechanism between layers of composite superconducting tapes. The stress distributions of a three-layer composite system are calculated based on the interlayer shear stiffness model. Then, the strain transmissibilities between different layers are further calculated considering the plastic deformation of the copper layer. Moreover, based on the proposed theoretical model, the shear strength of the composite superconducting tape is calculated. The model quantifies the stress transfer behavior between different layers of superconducting tapes, which provides the theoretical basis for the determination of the shear strength and suggests selecting a proper Hastelloy layer thickness can adjust the strain of the YBCO layer.
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