Numerical simulation of explosively compacted powder-in-tube MgB 2 Superconductor

Mamalis, AG; Theodorakopoulos, ID; Vortselas, AK

dc.contributor.author	Mamalis, AG	en
dc.contributor.author	Theodorakopoulos, ID	en
dc.contributor.author	Vortselas, AK	en
dc.date.accessioned	2014-03-01T02:53:23Z
dc.date.available	2014-03-01T02:53:23Z
dc.date.issued	2011	en
dc.identifier.issn	02555476	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36285
dc.subject	Explosive compaction	en
dc.subject	MgB2 superconductor	en
dc.subject	Numerical simulation	en
dc.subject	Powder in tube	en
dc.subject.other	Bean's critical-state model	en
dc.subject.other	Compaction process	en
dc.subject.other	Ex situ	en
dc.subject.other	Explicit finite element codes	en
dc.subject.other	Explosive compaction techniques	en
dc.subject.other	Explosive compactions	en
dc.subject.other	Field cooled	en
dc.subject.other	High-T	en
dc.subject.other	In-situ	en
dc.subject.other	LS-DYNA	en
dc.subject.other	Magnetisation	en
dc.subject.other	Magnetization measurements	en
dc.subject.other	Material temperature	en
dc.subject.other	MgB superconductor	en
dc.subject.other	Numerical simulation	en
dc.subject.other	Powder composition	en
dc.subject.other	Powder in tube	en
dc.subject.other	Powder-in-tube techniques	en
dc.subject.other	Precursor materials	en
dc.subject.other	Rate profiles	en
dc.subject.other	Soil-like materials	en
dc.subject.other	SQUID magnetometers	en
dc.subject.other	Superconducting properties	en
dc.subject.other	Yield surface	en
dc.subject.other	Zero-field-cooled	en
dc.subject.other	Compaction	en
dc.subject.other	Computer simulation	en
dc.subject.other	Critical current density (superconductivity)	en
dc.subject.other	High energy physics	en
dc.subject.other	Magnetization	en
dc.subject.other	Magnetometers	en
dc.subject.other	Shock waves	en
dc.subject.other	Strain rate	en
dc.subject.other	Superconducting materials	en
dc.subject.other	Superconducting transition temperature	en
dc.subject.other	Superconductivity	en
dc.subject.other	Explosives	en
dc.title	Numerical simulation of explosively compacted powder-in-tube MgB 2 Superconductor	en
heal.type	conferenceItem	en
heal.identifier.primary	10.4028/www.scientific.net/MSF.673.131	en
heal.identifier.secondary	http://dx.doi.org/10.4028/www.scientific.net/MSF.673.131	en
heal.publicationDate	2011	en
heal.abstract	High Tc MgB2 superconductors were fabricated using the ex-situ and in-situ powder in tube (PIT) technique. During treatment, the precursor materials were shock consolidated under high strain-rates using PETN as the explosive medium. After compaction, the superconducting properties of the steel-sheathed MgB2 samples were examined by means of magnetization measurements using a SQUID magnetometer. Bean's critical state model was applied to investigate the critical current density characteristics of the samples at fields up to 5T. The superconducting transition temperature of the specimens was determined by examining the material temperature dependence of magnetisation in zero field cooled (ZFC) and field cooled (FC) states. An assessment of the explosive compaction technique was carried out by simulating the procedure using the LS-DYNA explicit finite element code. The sample is modelled as a porous soil-like material with a customised yield surface. The numerically estimated final product dimensions, porosity and hardness are compared to the experimental results; furthermore, the numerically obtained pressure, temperature and strain rate profiles are used to assess the efficiency of the compaction process for different explosive quantities and powder compositions. © (2011) Trans Tech Publications.	en
heal.journalName	Materials Science Forum	en
dc.identifier.doi	10.4028/www.scientific.net/MSF.673.131	en
dc.identifier.volume	673	en
dc.identifier.spage	131	en
dc.identifier.epage	136	en