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Investigation of a bullet impact December 1 st 2010 Engineering 45 Fall 2010 Kevin Chee Shauna Fong Max Heald
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The Purpose The Setup The Results
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Purpose In this experiment our goal was to investigate the effects of a bullet impacting different materials. We accomplished this by cross sectioning the material at the bullet impact site then looking at the microstructure.
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Setup Material Preparation: – Steel: (2 thin, 2 thick) 1 of each thickness, heated to 900⁰C then furnace cooled 1 of each thickness, heated to 900⁰C then quenched to room temp
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– Brass: 1 sample 25% CW 1 sample 0% CW
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Gun used: 22 caliber rifle
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Range: ~10 ft
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Mount: materials were mounted on single wooden board via zip-ties.
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Thin steel furnace cooled impact
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Thin steel quenched impact
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Brass 25% CW
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Brass w/o CW
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Impact (head on)
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Impact (side view) Thick steel Thin Steel (quenched) Thin Steel (furnace cooled) Brass no CW Brass 25% CW
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Furnace cooled steel Microstructure: using Nital etching solution Impact direction
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Furnace cooled steel Microstructure #2
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Furnace cooled steel Microstructure #3
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Furnace cooled steel Microstructure: using FeCl 3 etching solution
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Furnace cooled steel Microstructure: using FeCl 3 etching solution #2
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Quenched steel
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Quenched Steel
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Brass no CW microstructure
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Brass 25% CW
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Shotgun slug vs Bulletproof vest
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Aknowledgements Thanks to Johnson’s winery in Alexander Valley for letting us use their location.
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