Author

Jacob

Date of Award

4-2006

Degree Name

Master of Science in Engineering

Department

Mechanical and Aerospace Engineering

Department

Mechanical and Aeronautical Engineering

First Advisor

Dr. John Patten

Second Advisor

Dr. Philip Guichelaar

Access Setting

Masters Thesis-Open Access

Abstract

Experiments were conducted to determine the critical depth of cut for machining of single crystal silicon carbide through Single Point Diamond Turning (SPDT) and fly-cutting, and of CVD coated Silicon Carbide through scratching. The ductile nature of these nominally hard and brittle materials is believed to be the result of a high pressure phase transformation, which generates a plastic zone of material that behaves in a metallic manner. The SPDT experiments have shown chip formation similar to that in metal machining. This metallic behavior is the basis for using AdvantEdge, metal machining simulation software, for comparison to experimental results. The cutting and thrust forces generated from the experiments and the simulations compared favorably when the simulation depth is below the critical depth of cut. The differences in the results that do arise are due to a difference in the actual simulated machining depth versus the expected machining depth as a result of workpiece deflection.

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