Abstract
Metal cutting speeds are getting faster with the development of high-speed cutting technology, and with the increase in cutting speed, the strain rate will become larger, which makes the study of the metal cutting process more inconvenient. At the same time, with the increase in strain rate, the dislocation movement controlling the plastic deformation mechanism of metal will change from thermal activation to a damping mechanism, which makes the metal deformation behave more like a fluid. Therefore, it is necessary to explore new ways of studying machining from the perspective of fluid flow. Based on this, a fluid model of the metal cutting process is established, and a method for calculating the strain rate is proposed from the point of view of flow. The results of the simulation and measurements are compared and analyzed. The results show that the strain rate on the rake face will be affected by the friction between the chip and tool; the nearer the distance between the chip layer and tool rake face, the bigger the strain rate will be. The strain rate in the central shear plane is much larger than in other areas along the shear plane direction, and in which two ends are the biggest. It can achieve rougher, quantitative research. This shows it is feasible to study machining from the viewpoint of fluid flow, though it still needs a lot of theoretical support and experimental confirmation.
Highlights
Describing the mechanical behavior of metal materials during the deformation process under different strain rate conditions is an important subject of solid mechanics
The results indicate that the dominant mechanism of plastic deformation is due to the increase and change in dislocation motion at different strain rates
The plastic deformation of metals is complex, as metal cutting is a process of dislocation accretion and annihilation
Summary
Describing the mechanical behavior of metal materials during the deformation process under different strain rate conditions is an important subject of solid mechanics. Metal deformation will show different behaviors under different strain rates, such as elasticity, plasticity or viscosity [2]. The material response at a low or medium strain rate is usually described by one behavior, elasticity or plasticity, or a combination of the two. The metal deformation form will change from static to dynamic behavior. The effects of material viscosity should be considered because it describes the viscous behavior of the materials in terms of the relevant strain rate (strain rate includes time factors). The relevant rate cannot accurately describe the viscous behavior of materials at high strain rates
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