Finiteelement analysis of transverse compressive and thermal loads on Nb _{3}Sn wires with voids
Highfield superconducting magnets play a very important role in many largescale physics experiments, particularly particle colliders and fusion confinement devices such as Large Hadron Collider (LHC) and International Thermonuclear Experimental Reactor (ITER). The two most common superconductors used in these applications are NbTi and Nb _{3}Sn. Nb _{3}Sn wires are favored because of their significantly higher J _{c} (critical current density) for higher field applications. The main disadvantage of Nb _{3}Sn is that the superconducting performance of the wire is highly strain sensitive and it is very brittle. This strain sensitivity is strongly influenced by two factors: plasticity and cracked filaments. Cracks are induced by large stress concentrators that can be traced to the presence of voids in the wire. We develop detailed 2D and 3D finiteelement models containing wire filaments and different possible distributions of voids in a bronzeroute Nb _{3}Sn wire. We apply compressive transverse loads for various cases of void distributions to simulate the stress and strain response of a Nb _{3}Sn wire under the Lorentz force. Furthermore, this paper improves our understanding of the effect voids have on the Nb _{3}Sn wire's mechanical properties, and in so, the connection between the distribution of voids and performancemore »
 Authors:

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 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Univ. of California, Santa Cruz, CA (United States). Dept. of Physics
 Univ. of Geneva (Switzerland) Dept Quantum Matter Phys; Univ. of Geneva (Switzerland) Dept Appl Phys
 Publication Date:
 Report Number(s):
 PPPL5207
Journal ID: ISSN 10518223
 Grant/Contract Number:
 AC0209CH11466
 Type:
 Accepted Manuscript
 Journal Name:
 IEEE Transactions on Applied Superconductivity
 Additional Journal Information:
 Journal Volume: 26; Journal Issue: 4; Journal ID: ISSN 10518223
 Publisher:
 Institute of Electrical and Electronics Engineers (IEEE)
 Research Org:
 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Sponsoring Org:
 USDOE
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; finiteelement analysis; fusion magnet; stress concentration; Nb3Sn; superconducting wires
 OSTI Identifier:
 1256389
Zhai, Y., D'Hauthuille, L., Barth, C., and Senatore, C.. Finiteelement analysis of transverse compressive and thermal loads on Nb3Sn wires with voids. United States: N. p.,
Web. doi:10.1109/tasc.2016.2535784.
Zhai, Y., D'Hauthuille, L., Barth, C., & Senatore, C.. Finiteelement analysis of transverse compressive and thermal loads on Nb3Sn wires with voids. United States. doi:10.1109/tasc.2016.2535784.
Zhai, Y., D'Hauthuille, L., Barth, C., and Senatore, C.. 2016.
"Finiteelement analysis of transverse compressive and thermal loads on Nb3Sn wires with voids". United States.
doi:10.1109/tasc.2016.2535784. https://www.osti.gov/servlets/purl/1256389.
@article{osti_1256389,
title = {Finiteelement analysis of transverse compressive and thermal loads on Nb3Sn wires with voids},
author = {Zhai, Y. and D'Hauthuille, L. and Barth, C. and Senatore, C.},
abstractNote = {Highfield superconducting magnets play a very important role in many largescale physics experiments, particularly particle colliders and fusion confinement devices such as Large Hadron Collider (LHC) and International Thermonuclear Experimental Reactor (ITER). The two most common superconductors used in these applications are NbTi and Nb3Sn. Nb3Sn wires are favored because of their significantly higher Jc (critical current density) for higher field applications. The main disadvantage of Nb3Sn is that the superconducting performance of the wire is highly strain sensitive and it is very brittle. This strain sensitivity is strongly influenced by two factors: plasticity and cracked filaments. Cracks are induced by large stress concentrators that can be traced to the presence of voids in the wire. We develop detailed 2D and 3D finiteelement models containing wire filaments and different possible distributions of voids in a bronzeroute Nb3Sn wire. We apply compressive transverse loads for various cases of void distributions to simulate the stress and strain response of a Nb3Sn wire under the Lorentz force. Furthermore, this paper improves our understanding of the effect voids have on the Nb3Sn wire's mechanical properties, and in so, the connection between the distribution of voids and performance degradation such as the correlation between irreversible strain limit and the voidinduced local stress concentrations.},
doi = {10.1109/tasc.2016.2535784},
journal = {IEEE Transactions on Applied Superconductivity},
number = 4,
volume = 26,
place = {United States},
year = {2016},
month = {2}
}