Numerical analysis method of cemented carbide turning tool's micro breakage based on peridynamic theory

This study presented here focuses on numerical analysis method of micro breakage in the region near main cutting edge of cemented carbide turning tool in the process of cutting 40CrMnMo based on peridynamic theory. FEM simulation of this cutting process is carried out firstly to extract load data of turning tool; then in the Visual C++ environment, the program of PD modeling and analysis is written using C language based on PD theory. With image processing unit in MATLAB, micro breakage visualization of the region near the main cutting edge of this tool is achieved, including the crack initiation position, displacement trend of material particle in different directions, and propagation tendency of crack. Combined with numerical simulation and cutting test, the numerical analysis method of cemented carbide tool's micro breakage based on PD theory is proved to be able to reveal the mechanism and propagation process of micro breakage inside the tool material of the region near the main cutting edge of the cemented carbide turning tool: the micro breakage under given working condition is mainly resulted from the mechanical micro crack in a certain angle with the normal of rake face caused by mechanical shock and has a trend of discontinuous extending to internal material. This method has a certain guiding significance for further research of the discontinuous breakage problems of tool material in the metal cutting process.