Analysis of Material Constitutive Model in Mesoscopic Scale Cutting Process

Abstract

Micro-machining can produce size effect under mesoscopic scale, by using the strain gradient plasticity theory of dislocation mechanism, considering the micro-structure characteristics of the material, the material constitutive model under mesoscopic scale is established, which can be used to explain the size effect of micro-machining. The material constitutive model under the mesoscopic scale derived from the theory is analyzed and studied based on oxygen - free copper, and the stress-strain curves and simulation results under different conditions are obtained in this article. The research shows that with the increase of cutting thickness, the stress-strain curve of the material will tend to the stress-strain curve of macro cutting.