Experimental Investigation on History-dependence of Plastic Behaviour of Brass under Combined Loading

Experimental investigations about the plastic deformation behaviours of brass at an initially isotropic state are performed along the strain trajectories with one or two corners starting at the zero-strain state in a vector space corresponding to strain deviators. Experimental results along the trajectories with one corner show that the history effect of a corner having a corner-angle less than 120゜ disappears with an increase of deformation along the trajectory after the corner. This feature verifies the existence of the so-called "Fading Memory". From the experimental results along thee trajectories with two corners, it is found that the effect of the first corner on the deformation behaviour after the second one disappears for arc length between both corners longer than a certain value, if the trajectory does not contain a reverse in the direction of strain increment. On the contrary, the deformation behaviour along the trajectory with a reverse is affected by a generalized Bauschinger effect.