Experimental identification of the overall elastic rigidities of superconducting windings

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract. This study deals with an experimental methodology developed in order to identify the elastic properties of superconducting ring-shaped windings, constituents of the main coil winding of a magnetic resonance imaging magnet (MRI). Mechanical tensile tests were conducted on real scale specimens associated to an optical full-field displacement measurement technique (stereo image correlation). Strain fields were then obtained from the measured displacement fields by numerical differentiation. Finally, the four in-plane orthotropic stiffnesses of the windings were determined using the Virtual Fields Method (VFM). Experimental set-up also allows detecting a possible occurrence of a delamination thanks to in-plane displacement fields.

Material Testing 2.0: A brief review

“…In references, [2,56] a thick composite ring cut from a thick glass-epoxy composite tube was used to identify the whole set of orthotropic stiffnesses in the through-thickness plane in the cylindrical coordinate system. In references, [57][58][59] rings formed of windings of superconductive wires were tested using a similar configuration. These are called 'pancakes' and stacked together to form superconductive coils for MRI magnets.…”