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Unformatted text preview: o make the system truly static, a tangential force (Rt) and a reaction moment (Mz) are also applied at the base of the tip to equilibrate the tangential force and torque respectively. The inertial forces due to the weight of the drill assembly are assumed to be negligible. The cutting forces (Fcutting) are applied at the top of the tip. Due to the small scale of the top of the tip compared with the tip’s overall dimensions, the tip’s geometry is altered from conical to cylindrical in the FEM analysis. This allows for easier application of the cutting force at the top of the tip. The reaction to the vertical cutting force (Rcutting) is assumed to act on the bottom of the hub, where the hub interfaces with the substrate. The free body diagram of the system is shown in Figure 4 (a). Error Analysis of a NanoMechanical Drill 283 Figure 4 (a) External loads; (b) Finite element mesh of the structure; (c) Finite element mesh showing constraints on the hub
Hypermesh and ANSYS are used to perform the s...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.
- Spring '10
- The Land