Lab three - September 27, 2007 Mrs. JoAnne Scales Section...

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September 27, 2007 Mrs. JoAnne Scales Section 10, Thursday 1-4pm Materials Science Engineering Program Vanderbilt University Nashville, TN 37235 Dear Mrs. Scales, The following letter discloses the results of the laboratory experiment carried out on Thursday, September 20, 2007. The purpose of the experiment was to determine the mechanical response to glass rods under four point bending. The rods underwent differing surface treatments to allow for comparison of mechanical reaction as a result of surface treatments. The theory behind the brittle fracture of glass is that the surface defects allow for crack propagation, and that surface treatments can reduce surface defects and increase the force required to break the rod. The lab group four-point tested 20 samples, four samples of each surface preparation. The surface preparations: 1. As-received 2. 240 Grit Sand Paper abraded 3. 400 Grit Sand Paper abraded 4. Hydro-chloric Acid etched The students prepared the samples, abrading eight samples with 240 or 600 grit sandpaper (four samples for each grit). Four HCL etched samples were delivered to the
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lab for testing, while four specimens were left unaltered. Upon breaking, each specimen’s
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This lab report was uploaded on 04/07/2008 for the course MSE 232 taught by Professor Wittig during the Spring '08 term at Vanderbilt.

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Lab three - September 27, 2007 Mrs. JoAnne Scales Section...

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