Journal of Undergraduate Materials Research: Session I
Sponsored by: MS&T Organization
Program Organizers: Shaimaa Abdallah, Virginia Tech
Tuesday 2:00 PM
October 18, 2011
Room: E160A
Location: Greater Columbus Convention Center
Session Chair: Ivar Reimanis, Colorado School of Mines
2:00 PM Student
A Combined Numerical and Experimental Approach to Measuring Gap Conductance for Precision Glass Molding: Christopher Ostrouchov1; Peiman Mosaddegh1; John Ziegert2; David Musgraves1; Paul Joseph2; Dhananjay Joshiand2; Peter Wachtel1; Kathleen Richardson1; 1Materials Engineering Clemson University; 2Mechanical Engineering Clemson University
An accurate Finite Element simulation of the Precision Glass Molding (PGM) process requires knowledge of the heat flux between the glass and the mold material; one major source of error in these models is the lack of experimentally verified data on the gap conductance between the glass and mold. In addition, a 3D ABAQUS model is implemented to simulate the experimental results. Both the experimental and simulation-based results show that the heat transfer at the interface of the glass and mold depends upon the thermal conductivity of metal, the gap conductance of the glass/mold interface, the level of the applied normal force, and the surface roughness of the mold material. The experimental and simulation-based results are not identical, but show a significant correlation. The value of the gap conductance is in the range of 500 to 550 W/m °C under a constant force of 100N in the experimental tests.
2:20 PM Cancelled
Characterization of a Shot Blast System: Haley Cherniuk1; Alan Druschitz2; Carlos Suchicital2; Robert Hendricks2; 1Virginia Tech ; 2Virginia Tech
Shot blasting is used commercially to provide a finished surface for a cast component. This technique uses small (< 1.0 μm) spherical or angular pieces of steel, with hardness ranging from RHC 40-60, and impels them at high velocities at a casting. The surface roughness, surface hardness and visual appearance of blasted 4130 steel pipes of varying heat treatments and tempers including normalized, and quenched and tempered at temperatures from 205-650 ̊C for 90 minutes, were determined. These heat treatments resulted in samples with hardnesses that varied from RHC 30-55. The surface properties were recorded following 0, 2, 4 and 8 minutes of shot blasting. Multiple regression techniques are being used to correlate surface roughness and appearance with shot size, blasting time, and material hardness. Such correlations will be invaluable for predicting surface properties of castings without having to learn by trial and error.