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Localization phenomena in shape memory alloys: experiments & modeling

Begin
End
Agency
GACR
Identification Code
GA18-03834S
Project Focus
teoretický
Project Type (EU)
other
Publications ÚTIA
Web
Abstract
This project is focused on systematic experimental investigation and theoretical description of nucleation and propagation of martensitic phase transformation via localized inhomogeneities in NiTi shape memory alloys, so-called transformation bands. The localization phenomenon strongly influences mechanical behaviors of these alloys and plays key role in understanding other material processes as transformation-induced plasticity or functional fatigue. Microstructural origins of the phenomenon will be investigated both experimentally – e.g. grain-by-grain mapping of stress and strain with advanced 3D XRD method – and through mathematical models. Based on the results, a macroscopic, mathematically and thermodynamically consistent nonlocal constitutive model will be formulated and implemented into a numerical software, which allows predictions of localization in practical applications. This project further elaborates and expands recent activities of the research team recognized and appreciated by the scientific community.

Keywords:

shape memory alloys; NiTi; localization; 3D-XRD; constitutive model

Research Team:

 

Submitted by kratochvil on