Tensile testing methods of Cu/Nb3Sn superconducting wires at room temperature

Citation
K. Katagiri et al., Tensile testing methods of Cu/Nb3Sn superconducting wires at room temperature, PHYSICA C, 357, 2001, pp. 1302-1305
Citations number
4
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA C
ISSN journal
0921-4534 → ACNP
Volume
357
Year of publication
2001
Part
2
Pages
1302 - 1305
Database
ISI
SICI code
0921-4534(200108)357:<1302:TTMOCS>2.0.ZU;2-V
Abstract
Preliminary tests for determining the procedure of round robin test on tens ile testing methods of Cu/Nb3Sn composite wires at room temperature have be en conducted. Two kinds of bronze processed wires were used. The following results were obtained. (1) The initial part of the stress-strain curve was liable to be varied. Be yond the stress level of about 80 MPa, stress-strain behaviors were basical ly identical regardless of the gripping method and the inter-grip distance although shifts in strain axis were inevitable. Pre-loading of about 40 MPa was fairly effective for obtaining a consistent stress-strain behavior for a wire. (2) A reliable modulus of elasticity could be determined using unloading cu rve regardless of the unloading stress level. (3) The stress-strain curves could be expressed as a simple exponential fun ction, which fitted the experimental data fairly well excepting initial par t and was useful to determine the zero strain position of the curves. (4) The 0.2% proof stresses with a coefficient of variance of less than 5% could be obtained using the zero strain position and the modulus of elastic ity. (C) 2001 Elsevier Science B.V. All rights reserved.