Abstract
To study the dynamic shear deformation and failure properties of Ti-6Al-4V (Ti-64) alloy and Ti-5Al-5Mo-5V-1Cr-1Fe (Ti-55511) alloy, a series of forced shear tests on flat hat shaped (FHS) specimens for the two investigated materials was performed using a split Hopkinson pressure bar setup. The evolution of shear deformation was monitored by an ultra-high-speed camera (Kirana-05M). Localized shear band is induced in the two investigated materials under forced shear tests. Our results indicate that severe strain localization (adiabatic shear) is accompanied by a loss in the load carrying capacity, i.e., by a sudden drop in loading. Three distinct stages can be identified using a digital image correlation technique for accurate shear strain measurement. The microstructural analysis reveals that the dynamic failure mechanisms for Ti-64 and Ti-55511 alloys within the shear band are of a cohesive and adhesive nature, respectively.
Highlights
IntroductionThe term “adiabatic shear band” ( called “adiabatic shear” or “adiabatic slip”, hereinafter referred to as “ASB”) has been widely accepted by researchers since it was first mentioned in the original report of Zener and Hollomon in 1944 [1]
The term “adiabatic shear band” has been widely accepted by researchers since it was first mentioned in the original report of Zener and Hollomon in 1944 [1]
Different nominal shear strains were obtained by varying the thickness of the stopper ring
Summary
The term “adiabatic shear band” ( called “adiabatic shear” or “adiabatic slip”, hereinafter referred to as “ASB”) has been widely accepted by researchers since it was first mentioned in the original report of Zener and Hollomon in 1944 [1]. ASBs are found in different dynamic loading processes, such as impact deformation, dynamic punching, ballistic impact and so forth [2]. Shear localization is an important failure mechanism of solid materials in high strain rate deformation, for example, titanium alloys. A considerable number of investigations on titanium alloys under dynamic loading condition have been conducted over the last two decades [4,5,6], especially for Ti-6Al-4V (Ti-64) alloy. Peirs et al [9] investigated the high strain rate shear behavior of Ti-64 alloy by using a hat shaped specimen and pointed out that the width of the shear region mainly affected the homogeneity of stress and deformation in the shear zone. The investigation of Xue et al [10]
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