Reconstruction of Heat Sources Induced in Superelastically Loaded Ni-Ti Wire By Localized Deformation Processes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F21%3A00532228" target="_blank" >RIV/61389005:_____/21:00532228 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/21:00541725 RIV/00216208:11320/21:10438346 RIV/68407700:21340/21:00344888

Výsledek na webu

<a href="https://doi.org/10.1007/s11340-020-00648-8" target="_blank" >https://doi.org/10.1007/s11340-020-00648-8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11340-020-00648-8" target="_blank" >10.1007/s11340-020-00648-8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Reconstruction of Heat Sources Induced in Superelastically Loaded Ni-Ti Wire By Localized Deformation Processes

Popis výsledku v původním jazyce

Background Shape memory alloys (SMAs) are phase transforming materials featuring strong thermomechanical couplings. Infrared thermography and heat source reconstruction (HSR) enable to track the calorific signature of deformation processes. Objective The objective was to characterize the transformation processes in a superelastic nickel-titanium SMA wire subjected to a force-controlled superelastic tensile cycle. Methods In-situ recorded thermographs were converted into spatiotemporal maps of heat sources using an in-house developed post-processing method based on the heat diffusion equation resolved numerically for unknown heat sources. Results Sequentially appearing patterns of localized transformation events of four types were identified and associated with martensite bands nucleations and their subsequent merging upon tensile loading. Analogically, the events associated with austenite bands nucleations and their subsequent merging were identified upon unloading. In addition, weak heat sources observed before and after the localized transformation events were associated with the homogeneous martensitic transformation. Conclusions The intrinsic dissipation heat associated with the nucleation and merging events is estimated to be similar to 25% of the released/absorbed latent heat.

Název v anglickém jazyce

Reconstruction of Heat Sources Induced in Superelastically Loaded Ni-Ti Wire By Localized Deformation Processes

Popis výsledku anglicky

Background Shape memory alloys (SMAs) are phase transforming materials featuring strong thermomechanical couplings. Infrared thermography and heat source reconstruction (HSR) enable to track the calorific signature of deformation processes. Objective The objective was to characterize the transformation processes in a superelastic nickel-titanium SMA wire subjected to a force-controlled superelastic tensile cycle. Methods In-situ recorded thermographs were converted into spatiotemporal maps of heat sources using an in-house developed post-processing method based on the heat diffusion equation resolved numerically for unknown heat sources. Results Sequentially appearing patterns of localized transformation events of four types were identified and associated with martensite bands nucleations and their subsequent merging upon tensile loading. Analogically, the events associated with austenite bands nucleations and their subsequent merging were identified upon unloading. In addition, weak heat sources observed before and after the localized transformation events were associated with the homogeneous martensitic transformation. Conclusions The intrinsic dissipation heat associated with the nucleation and merging events is estimated to be similar to 25% of the released/absorbed latent heat.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Experimental Mechanics

ISSN

0014-4851

e-ISSN

1741-2765

Svazek periodika

61

Číslo periodika v rámci svazku

FEB

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

349-366

Kód UT WoS článku

000564509000001

EID výsledku v databázi Scopus

2-s2.0-85090014592