M.S. (Master of Science)
Department of Mechanical Engineering
Ceramics are brittle material and possess lower toughness when compared to metals. This brittle nature results in the formation of cracks and cutting tool fracture when tried to machine conventionally. Thus, diamond grinding was the only method of processing ceramics until the development of Laser Assisted Machining (LAM). In LAM, a laser is used to rise the temperature of the surface of the component which is later machined conventionally. LAM yields in higher material removal rate and superior surface finish while reducing the total machining cost. At elevated temperatures ceramics act as a ductile material thereby enabling plastic deformation and generation of continuous chip. Temperatures attained during LAM has a huge impact on the end results, i.e. low temperatures lead to the formation of cracks whereas extremely high temperatures cause a change of microstructure. Thus, a study of thermal history is of utmost importance in LAM and performing such study through Finite Element Method (FEM) would help in predicting the temperature distribution in the sample. The temperature distribution is highly affected by the laser power, laser spot size, the rotation speed of the workpiece, translational velocity, and pre-heat time. Extensive research has been performed on LAM of solid cylinder both experimentally and theoretically but there hasn't been any research on LAM of hollow cylinders. A study of temperature histories for a hollow cylinder will be performed in this research to analyze its variation of temperature along the depth and distribution of temperature with varying depth. The employed procedure will be verified with the available data in the literature, either for solid or hollow cylinders.
Mohammed, Mujahid Mohiuddin, "Study of thermal history in hollow cylinder under laser-assisted machining process using FEM" (2017). Graduate Research Theses & Dissertations. 5122.
Northern Illinois University
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