Shear testing of Ti-6Al-4V alloy at high strain rates, up to 6 10{sup}E4 1/s

摘要

In this paper an experimental results are discussed which were obtained for T-6Al-4V alloy within a wide range of strain rates in shear from 10{sup}E-4 1/s to 6*10{sup}E4 1/s. An unique experimental technique based on the double shear concept was applied, [1]. This test method is very useful to properly develop and verify constitutive relations at low and high strain rates. The final form of constitutive relations could be applied in numerical analyses of shear bands, perforation or fragmentation. In addition a range of temperature was also analyzed, from very low to very high, approaching the melting point. The constitutive relations developed previously for an armor steel, have been updated for Ti-6Al-4V alloy, and all material constants for this alloy have been found. A criterion, based on the maximum plastic strain has been proposed to analyze fragmentation processes via failure by of Adiabatic Shear Bands, (ASB), for example [2]. Finally, a preliminary analysis of the Critical Impact Velocity in shear (CIV) has been performed for Ti-6Al-4V.