Date of Award

12-2010

Degree Name

Master of Science in Engineering

Department

Industrial and Manufacturing Engineering

First Advisor

Dr. John A. Patten

Second Advisor

Dr. Leonard Lamberson

Third Advisor

Dr. Steven Butt

Fourth Advisor

Dr. Tarun Gupta

Access Setting

Masters Thesis-Campus Only

Abstract

This work was focused on the analysis of a new process called micro Laser Assisted Machining (u-LAM). It is a ductile mode machining process being researched for machining of nominally hard and brittle ceramic and semiconductor materials like Silicon Carbide (SiC).

Numerical simulations were conducted using the finite element metal machining software 'AdvantEdge' to study the material behavior during the u-LAM process. The simulation model uses the pressure sensitive Drucker-Prager yield criterion to accommodate the material behavior due to a High Pressure Phase Transformation (HPPT). Various heating effects were created to mimic the actual machining process (laser heating and thermal softening). A realistic thermal softening curve was developed based on various references to simulate the thermal softening material behavior. A stress and temperature interaction study was done to identify the relative (percentage) contribution due to pressure (and HPPT) and temperature (thermal softening) during the u-LAM process. The cutting and thrust forces and the cutting pressures were compared at various temperatures of SiC to study the material behavior during the u-LAM process.

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