Strain sensing systems tailored for tensile measurement of fragile wires

Nyilas, A.

doi:10.1088/0953-2048/18/12/031

Cited by 44 publications

(36 citation statements)

References 4 publications

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“…Specimen strain was measured with a couple of very light Nyilas-type extensometers. 13) Stress was monitored with a load cell at each applied strain. Voltage taps for the measurement of voltage (V)current (I) curves were soldered with a spacing of 15 mm along the gage length of the extensometers.…”

Section: Methodsmentioning

confidence: 99%

Influence of Copper Volume Fraction on Tensile Strain/Stress Tolerances of Critical Current in a Copper-Plated DyBCO-Coated Conductor

et al. 2013

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The influence of the volume fraction (V f ) of copper, plated at room temperature over a DyBa 2 Cu 3 O 7¹¤ -coated conductor, on the tensile strain tolerance and stress tolerance of critical current at 77 K was studied over a wide range of copper V f values. The copper plating exerts a tensile stress during cooling because copper has a higher coefficient of thermal expansion than the substrate conductor. Before application of tensile strain, the copper plated at room temperature yielded at 77 K when the copper V f was lower than a critical value, and was in an elastic state at 77 K when the copper V f was higher than the critical value. The strain tolerance of critical current increased with increasing copper V f due to an increase in thermally induced compressive strain in the substrate tape. The stress tolerance of critical current decreased with increasing copper V f because copper is softer than the substrate tape. These results, together with the trade-off between strain tolerance and stress tolerance (i.e., stress tolerance decreases with increasing strain tolerance), were analyzed by modeling. The results show that the restriction imposed by the trade-off, which limits the ability to simultaneously obtain a high strain tolerance and a high stress tolerance, can be relaxed by strengthening the copper.

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Section: Methodsmentioning

confidence: 99%

Influence of Copper Volume Fraction on Tensile Strain/Stress Tolerances of Critical Current in a Copper-Plated DyBCO-Coated Conductor

et al. 2013

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“…These extensometers, produced by CryoMaK, can be adapted in a wide range according to tested materials and components. Within CryoMaK different kinds of extensometers are in use, details of the extensometers are described elsewhere [13][14][15]. Fig.…”

Section: New Cryomak Facilities 31 Mts 100 Landmarkmentioning

confidence: 99%

Cryomak – The Overview of Cryogenic Testing Facilities in Karlsruhe

Sas¹,

Weiss²,

Bagrets³

2015

Acta Metall Slovaca

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Since the field of cryogenic applications and testing has become very valuable, demand for material specification and improvements in this area has increased as well. One of the possibilities for the characterisation of cryogenic materials with a wide range of tests can be found at the Cryogenic Material Test Facility Karlsruhe (CryoMaK), within the Institute of Technical Physics (ITEP) at the Karlsruhe Institute of Technology (KIT). Skills, knowledge and best practices, related to cryogenic testing, have been developed by CryoMaK for over 30 years. The facility provides a possibility of measuring mechanical, electromechanical and thermal properties of materials and components. Further it is possible to measure tensile force (F), critical magnetic field (Bc) and critical current (Ic) to examine the quench behaviour of superconducting current cables. This article describes new facilities as well as possibilities in relation to testing in CryoMaK.

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“…Tensile load was applied by using a universal testing machine (Shimadzu AG-IS) with a 5 kN load cell until failure of the sample [7]. A Nyilas-type double extensometer with a 15 mm gage length was placed at the middle part of the sample to measure the strain experienced by the PPLP sample during the test [8]. For the test at cryogenic temperature, the PPLP sample was submerged on a dewar containing liquid nitrogen (LN 2 ) and held for 10 min before applying the tensile load.…”

Section: Mechanical Properties Of Pplp Materials At Cryogenic Temperaturementioning

confidence: 99%

Mechanical Properties of PPLP Material at Cryogenic Temperature

Gorospe¹,

Shin²

2012

Progress in Superconductivity and Cryogenics

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Abstract-In power cables as one of the important power applications adopting HTS tapes, a good insulation should be kept at its optimum performance. As an insulation material for superconducting device applications, polypropylene laminated paper (PPLP) is now widely used instead of the conventional Kraft paper. In addition to its dielectric property, the insulation material should also possess superior mechanical property at cryogenic temperatures and operability that is necessary for the insulation winding process. This study aims to evaluate the mechanical property of the PPLP material at ambient and cryogenic temperatures. At cryogenic temperature, the failure stress of PPLP increased significantly as compared with that at ambient temperature. The failure stress at both temperatures depended upon the sample orientation to the load application.

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Strain sensing systems tailored for tensile measurement of fragile wires

Cited by 44 publications

References 4 publications

Influence of Copper Volume Fraction on Tensile Strain/Stress Tolerances of Critical Current in a Copper-Plated DyBCO-Coated Conductor

Influence of Copper Volume Fraction on Tensile Strain/Stress Tolerances of Critical Current in a Copper-Plated DyBCO-Coated Conductor

Cryomak – The Overview of Cryogenic Testing Facilities in Karlsruhe

Mechanical Properties of PPLP Material at Cryogenic Temperature

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