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URN etd-0905113-143624 Statistics This thesis had been viewed 1797 times. Download 763 times. Author Chen-Pin Huang Author's Email Address No Public. Department Mechanical Engineering Year 2012 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 88 Title Finite Element Simulation of Friction on Chip – Tool Contact in Orthogonal Metal Cutting Keyword ANSYS/LS-DYNA Friction coefficient model Finite element Orthogonal metal cutting process Orthogonal metal cutting process Finite element Friction coefficient model ANSYS/LS-DYNA Abstract In this research, a commercial finite element software ANSYS/LS-DYNA is applied to develop a coupled thermo-mechanical model based upon Lagrange formulation to simulate the orthogonal metal cutting processes. The materials used for cutting tool and workpiece in the model are tungsten carbide and AISI 4340 steel, respectively. Both of them are modeled by the Johnson and Cook dynamic constitutive material equation. Cutting tool is modeled as a deformable body, but not a rigid body. This will facilitate to understanding the behavior of the cutting tool while machining. The element failure law based upon a failure strain for a material is used for the chip separation criterion.
When the finite element method is used to simulate the metal cutting process, it is necessary and important to support the friction characteristics that agrees with the principle of metal cutting and material properties used for tools and workpiece. The study proposes a method to investigate the friction behavior on the chip-tool interface, including set up the friction model using the stress distribution on the chip-tool interface resulted from simulation, analyze the friction model to get new friction coefficients, and re-simulate using iterative approach to obtain the correct coefficients of friction. The study proposes a method to investigate the friction behavior on the chip-tool interface, including the establishment of the friction model form the distribution stresses of simulation results on the chip-tool interface, the analysis of the friction model to get new coefficients of friction, and the re-simulation using iterative approach to obtain the correct coefficients of friction.
Advisor Committee Ching-Chih Tai - advisor
Files Date of Defense 2013-07-29 Date of Submission 2013-09-05