In order to investigate the mechanical properties of single crystal Cu nanorod with preset defects, the multiscale unixial tension simulation models of nanorods with two different crystallographic orientations are established. In two orientations, the dislocations are emitted firstly from the notch tip. The results show that the defect evolution, stress-strain curves and train energy vary with different crystallographic orientations. In setup, the deformation is ductile mode and it is fracture fashion in the setup.
Tool wear plays an important part during cutting process, and wear loss has a close relationship with cutting condition, which affects machined surface mostly. In order to accomplish tool wear prediction in way of FEM, based on founding of cutting model under steady state, interrelated parameters needed for tool wear prediction, such as cutting temperature, contact pressure and raletive sliding velocity are extracted. By compiling Python subprogram and using Abaqus tool in hard cutting process PCBN tool wear is predicted, which provide foundation for optimizing cutting condition.
Experiment of hard cutting GCr15 with PCBN cutting tools, the influence of tool’s
inclination angle and cutting parameters (cutting speed and feed speed) on cutting forces and cutting
temperature are studied. A three-dimensional finite elements model using the commercial software
Deform 3D 5.03 is developed. The friction between the tool and the chip is assumed to follow a
modified Coulomb friction law and the adaptive remeshing technique is using for the formation of
chip. The workpiece material property is a function of temperature, strain, and strain rate in the
primary and secondary shear zones. Finite element method is used to simulate three-dimensional
precision cutting, including orthogonal cutting and oblique cutting. The cutting forces and back
forces are slightly changed by tool’s inclination angle. However, in high cutting speed, the cutting
force decrease as the tool’s inclination angle increase, while the cutting temperature increase as the
tool’s inclination angle increase. The simulation results are compared with experimentally measured
data and found to be in good agreement to some extent.
Quasicontinuum simulation of nanometric cutting was conducted on single crystal copper to investigate the effect of crystal orientation and cutting direction on nature of deformation of this material. The model reduces the degrees of freedom in simulations of nanometric cutting process without sacrificing important physics. The simulation results show the crystal orientation and cutting direction have a significant effect on the nature of deformation of nanometric cutting process. In addition, the variations of strain energy of workpiece atoms in different crystal set-ups are investigated.
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