NUMERICAL STUDY OF STRESS-STRAIN LOCALIZATION IN THE TITANIUM SURFACE MODIFIED BY AN ELECTRON BEAM TREATMENT

• Published in: Facta Universitatis. Series: Mechanical Engineering Vol. 14; no. 3; pp. 329 - 334
• Main Authors: Balokhonov, Ruslan, Romanova, Varvara, Panin, Alexey, Martynov, Sergey, Kazachenok, Marina
• Format: Journal Article
• Language: English
• Published: Nis University of Nis 01-12-2016; University of Niš
• Subjects: Boundary value problems; Constitutive models; Crop yield; Electron beam processing; Finite difference method; Initial conditions; Mathematical models; Mechanical analysis; Microstructure; Plane strain; Plastic deformation; Strain localization; Stress-strain relationships; Substrates; Titanium alloys; Titanium base alloys
• ISSN: 0354-2025; 2335-0164
• DOI: 10.22190/FUME1603329B

Numerical simulation is performed to investigate the mesoscale stress-strain localization in a surface-modified commercial titanium alloy. The calculated crystalline microstructure corresponds to that observed in experiments and is accounted for in an explicit way as initial conditions of a dynamic boundary-value problem. The latter is stated in terms of plane strain developing in microstructure subjected to tension and is solved numerically by the finite-difference method. Elastic-plastic constitutive models were built to describe the experimental mechanical response both of the substrate and of the modified layer. Plastic strain localization is found to depend on the grain yield strength.