Open AccessDynamic Necking of a Near α Titanium alloy at High Strain Rates: Experiments and Modelling
Author(s) -
L. Zhang,
Antonio Pellegrino,
Nik Petrinić
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1507/3/032047
Subject(s) - necking , strain rate , materials science , strain (injury) , stress (linguistics) , composite material , constitutive equation , ultimate tensile strength , titanium alloy , finite element method , alloy , mechanics , structural engineering , engineering , physics , medicine , linguistics , philosophy
The tensile behaviour of near α Ti3Al2.5V alloy, conceived for applications in aerospace and automotive engineering, is characterized from quasi-static to high strain rates. The material presents noticeable strain rate sensitivity. The dynamic true strain rate in the necking cross-section reaches values up to one order of magnitude higher than the nominal strain rate. It is also observed that beyond necking the true stress-strain curves present limited rate dependence in the dynamic loading regime. The experimental results at various strain rates and temperatures are used to determine the material parameters of a suitable constitutive model for finite element simulations of the dynamic tensile tests. The model predicts the experimentally macroscopic force-time response, true stress-strain response and effective strain rate evolution with good agreement.