Tudy on the Scale Effect of Nan scale Indentation on Yield Strength and Modulus of Elasticity

In recent decades, many micromechanics experiments have proved that the mechanical behavior of metal materials at the scale of micron or submicron scale is quite different from that of materials under macroscopic scale (above millimeter order). When the characteristic length of the no uniform plastic deformation reaches the magnitude of micrometer or submicron, the material will show a very strong scale effect. In this paper, we mainly study the scale effect of the two parameters, the yield strength and the modulus of elasticity, which are very important in the mechanical constitutive equation. The scale effect of yield strength can be studied by using the H-P formula. With the further research, it is found that the modulus of elasticity have obvious scale effect. (paper)