Deformation And Failure Behaviour Of
Ti-6Al-4V Alloy Under High Rate Shear Loading
Author(s)
W. S. Lee & S. Z. Huang
Abstract
This study uses the torsional split-Hopkinson bar to investigate the dynamic
shear deformation and fracture behaviour of Ti-6Al-4V alloy under strain rates
of 1800 s-1, 2300 s-1, and 2800 s-1 at temperatures ranging from -100 oC to
300 oC . It is found that the strain rate and temperature both have a strong
influence on the dynamic shear properties and fracture characteristics of the
alloy. An increased work hardening stress and a reduced temperature cause the
strain rate sensitivity to increase and the activation volume to decrease.
However, the activation energy increases with decreasing shear stress and is
found to attain a maximum value of 15 KJ/mole under the current test
conditions. Fracture analysis reveals that the failure of the tested alloy is
dominated by the formation of an adiabatic shear band. A transformed shear
band is identified at sub-zero temperatures, whereas a deformed shear band is
found at temperatures above room temperature.
Keywords: Ti-6Al-4V, strain rate and temperature effects, activation energy,
adiabatic shearing.
1 Introduction
Ti-6Al-4V alloy is a lightweight material with excellent strength characteristics.
Accordingly, it is employed in the fabrication of a wide variety of aerospace and
transportation components. During operation, these components are frequently
subjected to high-speed motion and are exposed to extreme temperature
variations. Therefore, they are liable to undergo high-rate impacts and are
consequently exposed to the risk of unplanned catastrophic destruction. It is well
Keywords
Ti-6Al-4V, strain rate and temperature effects, activation energy,
adiabatic shearing.
Related Book
Other papers in this volume
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