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MSC Seminars
Characterization and modeling of the mechanical behavior of superconducting materials
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Europe/Zurich
112/R-028 (CERN)
Description
Abstract
In order to predict the electrical behavior and to optimize the manufacturing process of superconducting cables, an accurate assessment of the mechanical behavior of the strands is needed. Furthermore, the mechanical damage phenomena involved in the degradation of their electrical performance are not well understood. The COCASCOPE project aims to model the behavior of superconducting cables at different scales for the optimization of their electrical performance. In this framework, four superconducting strands were studied: one MgB2 Powder-In-Tube strand and three Nb3Sn strands (Internal-Tin, Powder-In-Tube and Restacked-Rod- Process). Mechanical characterizations of the components of the strands were carried out at various scales through nano-indentation tests and tests on strands with and without outer-layer. Using this multi-scale database, a strategy to model the mechanical behavior of superconducting strands was developed. The identification of the parameters of hardening laws of the elasto-plastic model developed for the MgB2 and Nb3Sn-IT strands will be introduced. The constitutive equations are built for future use in multi-scale finite element simulations to predict both mechanical and electrical behaviors. Analysis of damage will also be discussed based on observations of longitudinal cross-sections after interrupted tensile tests, tensile tests performed inside a X-ray tomograph and on the analysis of the strain localization in strands.