1959 年 28 巻 8 号 p. 481-486
Surface of pure polycrystalline copper and (100) and (111) faces of copper single crystal are electrolytically polished to remove worked layers and reduced in pure hydrogen atmosphere at 500°C. After cooled, coefficient of static friction μ between two such surfaces is determined, one surface being spherical laid on the other surface that is plane. The load applied is 45_??_65g. The value of μ ranges 20_??_40 for /(111), 40_??_70 for /(100), 70_??_100 for /(100) and 40_??_110 for polycrystal. Friction tracks under microscope show that the contact area produced by mere normal loading grows up to a width of 0.4_??_0.5mm. Adhesion takes place over nearly the whole width of friction tracks with a length about twice the width. Shear strength calculated by dividing the product μ×load by the estimated adhesion area gives correct order of magnitude for the shear strength of copper. Direct observation of worked layers is made upon sections of the lower specimens which shows that the shearing occurs within the upper specimens.