Compression test of aluminium at high temperature

Abstract

Compression test of aluminum alloy at high temperature were experimentally carried out on universal testing machine at specified temperatures ranging from 35oC (room temperature) to 225oC and under a constant strain rate of 0.001/s using powdered graphite mixed with machine oil as lubricant throughout the tests. True Stress and strain values were calculated using the engineering equation, which were used to plot the true stress-strain curve for different temperatures, which indicates the mechanical properties of the metal for industrial applications. A common characteristic equation considering true stress, true strain and temperature has been found out using regression analysis .Generalized characteristic equations for each temperature have also been developed by regression analysis, which indicates that the strain hardening exponent first increases, then decreases with increasing temperature, while strength coefficient decreases with increase in temperature.