Influence of Edge Geometry on the Delamination Strength of REBCO CC Tapes Using Anvil Test Method

分层(地质) 材料科学 复合材料 环氧树脂 极限抗拉强度 焊接 GSM演进的增强数据速率 压力(语言学) 电磁线圈 横截面 结构工程 电信 构造学 生物 电气工程 工程类 哲学 古生物学 俯冲 语言学 计算机科学
作者
Alking Gorospe,Marlon J. Dedicatoria,Hyung-Seop Shin
出处
期刊:IEEE Transactions on Applied Superconductivity [IEEE Council on Superconductivity]
卷期号:26 (4): 1-5 被引量:21
标识
DOI:10.1109/tasc.2016.2526661
摘要

In wet-wound epoxy impregnated coils, the whole coated conductor (CC) tape structure experiences radial/transverse tensile stress due to large Lorentz force, which might induce delamination damage and in turn affects its transport performance during operation. The characterization of the delamination strength of CC tapes is therefore necessary for such practical applications. The anvil testing method was done to characterize the mechanical properties of REBCO CC tapes considering the possible transverse tensile stress condition in CC tape windings in coil applications. The delamination strength of three different CC tape samples slit from a 12-mm-wide one was determined using two different sized upper Cu anvils. It was observed that the slitting process has resulted to different CC tape edge geometries such as burrs and filleted corners of the substrate layer. As a result, significantly lower mechanical delamination strength was exhibited by the CC tapes when their whole width was covered by the upper anvil. Using the wide upper anvil, the edge geometry such as burrs and thick stabilizing layer played an important role on the delamination damage of the CC tape. Using a statistical method, the intrinsic strength of the CC tapes was distinguished from those that were affected by poor soldering, misalignment, and other external factors during the tests. Delamination sites mainly occurred within the REBCO film and on the buffer/REBCO interface. Finally, delamination schematics were drawn based on the delaminated CC tape's morphology.
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