抄録
Tensile tests have been carried out at room and low temperatures in order to examine the applicabilities of Hollomon equation σ=KHεnH and Ludwik equation σ=σ0+KLεnL to the stress-strain curves of Al-Mg, Al-Cu and Al-Zn alloys. Hollomon equation does not hold in each alloy, and the higher the solute concentration, the larger the deviation from the linearity on log-log plots. On the other hand, Ludwik equation agrees well with the observed stress-strain relationship in low strain ranges where values of nL are approximately equal to those calculated from the slopes of log-log plots of dσ/dε and strain. The amount of strain to maximum load which is predicted from Ludwik equation in higher strain ranges is fairly close to the observed one.
