We are pleased to announce that Dr. Mohsen Rezaee Hajidehi from the Department of Mechanics of Materials at IPPT PAN has received the award for the best research article by a young scientist published in the International Journal of Solids and Structures in 2023. The title of the awarded paper is: “Predicting transformation patterns in pseudoelastic NiTi tubes under proportional axial–torsion loading,” co-authored by Prof. Stanisław Stupkiewicz.
Publication:
“Predicting transformation patterns in pseudoelastic NiTi tubes under proportional axial–torsion loading”. Mohsen Rezaee-Hajidehi, Stanisław Stupkiewicz, Int. J. Solids & Structures, V. 281
The paper presents the results on modeling deformation instabilities and propagation of localized transformation bands in NiTi shape memory alloy tubes subjected to proportional axial–torsion loading. The authors refer directly to the experiments conducted by Reedlunn et al. (2020), focusing on unique martensitic transformation patterns whose features depend on the loading path. The study utilizes a previously developed gradient-enhanced model of pseudoelasticity, which has been further refined by accounting for residual stresses. Additionally, the finite-element-based computational model accounts for the frictional slips that arise due to the contact interactions between the sample and the grips.
The results indicate that the model effectively replicates the subtle features of the localization bands observed in experiments, such as the multi-fingered transformation fronts that appear under tension-dominated loading and helical bands under torsion-dominated loading. Moreover, experiments conducted on samples under simple torsion revealed unique longitudinal localization bands, which have not been captured by the existing models. The awarded research has been the first to capture such localization bands. Additionally, it suggests that the combined effect of residual stresses and frictional slips in the grips promotes the formation of longitudinal localization bands.
Dr Mohsen Rezaee Hajidehi defended his PhD thesis (in Civil Engineering) titled “Nonlinear analysis of reinforced concrete frames: safety evaluation and retrofitting techniques,” at the University of Palermo, Italy, in 2018, under the supervision of Prof. Giuseppe Giambanco from the University of Palermo and Prof. Stanisław Stupkiewicz from IPPT PAN (co-supervisor).
Since 2018, he has been working at the Department of Mechanics of Materials at IPPT PAN (as an Assistant Professor since 2019). His main scientific interests include modeling the phenomenon of martensitic transformation in pseudoelastic shape memory alloys (SMA). This includes macroscopic modeling of instabilities in SMA, their functional fatigue, and microscopic modeling of martensitic microstructures in SMA using the phase-field method. Additionally, his work involves modeling the phenomenon of deformation twinning in magnesium alloys.
We extend our heartfelt congratulations on this recognition.
Information about the Award from the International Journal of Solids and Structures: www
