Abstract
Shape memory alloy has been attracting because of its unique characteristics such as the shape memory effect and the superelasticity. These behaviors arise from reversible movement of atoms during the martensitic transformation driven by thermomechanical loadings. In the present paper, the molecular dynamics simulation of stress-induced martensitic transformation in a NiAl shape memory alloy is carried out focusing on the relation between the evolution of martensite variant and resulting stress-strain behavior. In order to simulate martensitic transformations and to observe stress-strain relation under combined stress state the Parrinello-Rahman method with periodic boundary conditions is used. Microscopic martensite variants are classified by the relative displacement and the angle between transformation shear planes which is identified by change in lattice parameters. In the present simulation, there exist three types of martensite variant depending on the loading direction. The transformation stress varies with the loading direction. Martensitic transformation under simple shear starts and finishes at higher stress level compared to tension and compression. Martensite finish stress is higher in compression than in tension while there is no significant difference in martensite start stress.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
