Reconstruction of phase distributions in NiTi helical spring: comparison of diffraction/scattering computed tomography and computational modeling

0536066 - ÚT 2021 RIV GB eng J - Journal Article
Frost, Miroslav - Ševčík, Martin - Kadeřávek, Lukáš - Šittner, Petr - Sedlák, Petr
Reconstruction of phase distributions in NiTi helical spring: comparison of diffraction/scattering computed tomography and computational modeling.
Smart Materials and Structures. Roč. 29, č. 7 (2020), č. článku 075036. ISSN 0964-1726. E-ISSN 1361-665X
R&D Projects: GA ČR GA18-03834S
Institutional support: RVO:61388998 ; RVO:68378271
Keywords : NiTi * helical spring * diffraction-scattering computed tomography * modeling
OECD category: Applied mechanics; Materials engineering (FZU-D)
Impact factor: 3.585, year: 2020
Method of publishing: Limited access
https://iopscience.iop.org/article/10.1088/1361-665X/ab8c26

We successfully reconstructed spatial phase distributions within a cross-section of a stretched NiTi helical spring via x-ray diffraction/scattering computed tomography (DSCT) and compared them with predictions obtained from a finite element simulation, the simulation employed an established phenomenological constitutive model tailored for NiTi shape memory alloys. The comparison corroborated the direct correspondence between the internal variables representing (volume fraction of) phases in the constitutive model and their experimental counterparts. This case study also showed that because of the distinct diffraction contrast between austenite and martensite, DSCT allows visualization of phase gradients within the material.
Permanent Link: http://hdl.handle.net/11104/0314014