Abstract
The increased application of aluminum alloy in the past decades in automotive industries has suggested the researchers to study its behavior under different loading conditions and applications. Tungsten inert gas (TIG) welding in aluminum alloy is one of the widely used methods to manufacture the automobile parts. The strength of welded components may differ under different loading conditions. Moreover, if cracks develop in the welded components during their service period, it makes the working conditions worst. The working efficiency of same component may differ at different strain rates. The effect of strain rate on the fracture behavior of aluminum alloy containing cracks or notches is important to be studied to predict the failure of the component. The present work describes an experimental investigation to study the influence of high strain rates on the fracture behavior and tensile properties of welded 6061 aluminum alloy. The tensile tests have been performed on 100kN Universal Testing Machine under uniaxial static loading. At higher strain rates, considerable increase in yield strength and ultimate tensile strength has been observed. This may be due to insufficient elastic recovery time at higher crosshead speed, and thus the yield as well as ultimate strength of the material increases.
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