Vpliv napetostnega stanja na mikrostrukturo ortodontske spominske zlitine NiTi : doktorska disertacija

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Vpliv napetostnega stanja na mikrostrukturo ortodontske spominske zlitine NiTi : doktorska disertacija

Ferčec, Janko

V doktorski disertaciji je obravnavan problem vpliva večosnega napetostnega stanja na začetek in potek superelastičnega področja pri spominski zlitini Ni-Ti. Za raziskovalno delo je bila uporabljena ... komercialno dostopna ortodontska žica Ni-Ti z vsebnostjo 50,6 at.%Ni. V prvem delu raziskav smo izvedli karakterizacijo izbranega materiala. Določili smo transformacijske temperature Ms, Mf, As, Af, module elastičnosti, napetosti in deformacije na začetku in koncu superlastičnega področja ter analizirali mikrostrukturo v izhodnem nedeformiranem stanju. Z in-situ merjenjem električnega upora med obremenjevanjem pri enoosnem nategu na napravi za simulacijo enoosnega napetostnega stanja smo potrdili uporabnost te metode za določitev prehoda v superelastično stanje oziroma za spremljanje napetostno inducirane martenzitne fazne transformacije. Na osnovi teh rezultatov smo v drugem delu raziskav razvili napravo za simulacijo večosnega napetostnega stanja z možnostjo in situ merjenja električne upornosti in mikrotrdote. Z upogibom, torzijo ter kombinacijo torzije in upogiba smo simulirali obremenitve, ki so prisotne pri ortodontskem zdravljenju. S sočasnim merjenjem električnega upora smo za ta večosna napetostna stanja določili prehod v superelastično področje. Z analizo mikrostruktur pred in po obremenitvah smo identificirali spremembe in postavili modele razvoja mikrostrukture za različna napetostna stanja.

Type of material - dissertation ; adult, serious

Publication and manufacture - [Maribor : J. Ferčec], 2014

Language - slovenian

COBISS.SI-ID - 273707520

Link(s):
Digital Library of the University of Maribor – DLUM
Digitalna knjižnica Slovenije - dLib.si

Dostop z namenskih računalnikov v prostorih NUK

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Other authors
Rudolf, Rebeka | Anžel, Ivan, inženir metalurgije in materialov

Availability in libraries

Library/institution	City	Acronym	For loan	Other holdings
Library of Technical Faculties, Maribor	Maribor	KTFMB	reading room 1 cop.
National and University Library, Ljubljana	Ljubljana	NUK	reading room 1 cop.	not for loan 1 cop.
University of Maribor Library	Maribor	UKM	reading room 1 cop.

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Year	JCR	SNIP	JCR	SNIP	JCR	SNIP	JCR	SNIP

Links to authors' personal bibliographies	Links to information on researchers in the SICRIS system
Ferčec, Janko	33259
Rudolf, Rebeka	14335
Anžel, Ivan, inženir metalurgije in materialov	10369

Source: Personal bibliographies and: SICRIS

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