Abstract
In this study, the effect of compressive strain on free surface roughening is investigated by proposed compression test. In this test, specimen is held between flexible tools to prevent buckling. As a result of metal sheets such as C1220P-O, SPCC and A5052-O with thickness of 0.5mm, specimen surface contacting flexible tool is equal to free surface roughening. For pure copper sheets, the roughness evolution under compressive strain state is lower than that under tensile strain state. Furthermore the surface roughness decreases in the order of plane strain, uni-axial compression, pure shear. It is found that the free surface roughening under compressive strain depends on strain state.
