Abstract
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.
Highlights
Metals employed in automatable and aeronautical applications are often undergoing highspeed deformation process
The average maximum true stress value is equal to 1072 MPa and the average true strain to failure is 71 %
This paper studies the tensile behaviour of a near α Ti3Al2.5V alloy from quasi-static to high strain rates, with particular emphasis on revealing whether there is any locking effect on the rate dependence of a titanium alloy
Summary
Metals employed in automatable and aeronautical applications are often undergoing highspeed deformation process. The dynamic tensile behaviour of metals has been popularly characterized by means of the Split Hopkinson Tension Bar apparatus (SHTB) since Harding et al.[1]. The interpretation of this experiment is subjected to non-uniform deformations and dynamic necking localization. To improve the accuracy of the dynamic measurement, the SHTB with high-speed image recording can provide the real time information of the tensile deformation and the necking localization, as reported by Noble et al.[2] and Mirone[3]. Qin et al.[4] reported the strain evolution of the dual-phase high strength steel specimens and Tzibula et al.[5] examined the dynamic stress and strain evolutions in polymers using high speed DIC technique. Sato et al [6] employed the DIC technique to determine dynamic response at large strains by determining the true stress–strain data in the necked zone
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