Investigations have been carried out to study the effect of temperature on crack growth under creep condition in 6061 Al alloy. A parameter approach, connecting the three variables - crack growth rate a˙, the load point deflection rate Δ˙ and the applied load P - given in the form
$a˙∝Δ/˙PPoα1/θ$
where α, θ, and Po are constants, has been found to give good correlation with the experimental data. The exponents, α and θ, are dependent on temperature. The activation energy for the crack growth process has been found to be around 24 Kcal/mole.
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