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Lookup NU author(s): Dr Dehong Huo
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Amorphous alloys have excellent physical and mechanical properties compared with traditional crystalline metals due to their unique microstructure. Previous research on nanometric cutting of amorphous alloys has observed several unusual phenomena, including high ratio of normal cutting forces to main cutting forces and distinct volume expansion of atomic clusters during shear deformation. With the aim to reveal the micro cutting mechanism of amorphous alloys, this paper investigates the effect of stress on shear dilatation and cutting force in nanometric cutting of Cu50Zr50 amorphous alloys by molecular dynamics simulation. In order to verify the calculated atomic true stress, stress-strain curves were obtained by the resolution of virial stress in the shear simulation of amorphous Cu50Zr50. The volume change before and after cutting process shows that due to the shear deformation the volume expansion phenomenon is much noticeable when nanometric cutting of Cu50Zr50 amorphous alloy. In addition, shear dilatation during shear deformation results in an increase of normal stress on the machined plane. The stress simulation results show that stresses on the rake face and flank face are approximately equal. The shear deformation simulation of micro units of the workpiece surface indicates that the normal stress on the shear plane increases significantly with the increase of shear stress, therefore normal force on the shear plane increase significantly. The paper concludes that the increase of normal stress causes the shear dilatation, and then results in the phenomenon that the normal cutting force is equal to the main cutting force in nanometric cutting of Cu50Zr50 amorphous alloys.
Author(s): Zhao Y, Li T, Zhang Y, Wang J, Huo D
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 17th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2017
Year of Conference: 2017
Acceptance date: 01/01/1900
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