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The Breaking of Glass

The Breaking of Glass. Strobe 6: Friday 10am–1pm strobe6@mit.edu Adam Seering aseering@mit.edu Aubrey Tatarowicz altat@mit.edu Daniel Hernandez djh@mit.edu John Hawkinson jhawk@mit.edu. Strobe 6 Final Project. We want to characterize how glass breaks.

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The Breaking of Glass

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  1. The Breaking of Glass Strobe 6: Friday 10am–1pmstrobe6@mit.edu Adam Seering aseering@mit.edu Aubrey Tatarowicz altat@mit.edu Daniel Hernandez djh@mit.edu John Hawkinson jhawk@mit.edu Strobe 6 Final Project

  2. We want to characterize how glass breaks. • Does glass deform when impacted? • How does it deform? • Can we measure deformation? • After impact, how do the cracks form? • Can we measure crack formation speeds? • In what directions do cracks form?

  3. Basic HSV Setup

  4. A look at the Grid and Diffuser

  5. Edge Illumination for Viewing Cracks

  6. Results for Crack Formation Phantom. 50 mm lens. 75,000fps. aperture = f/1.8. 4 pumps on BB gun.

  7. Analysis of Crack Formation

  8. Data Points Collected Collected data in pixels and used the following to convert to mm: 178 pixels = 25mm

  9. Calculating Crack Formation Velocity from Data • Crack 5: • 36 mm x 75,000fps = 2.7 x 106 mm/s = 2700 m/s • Fastest Recorded Crack Speed: • 46mm x 75,000fps = 3.45 x 106 mm/s = 3450 m/s.

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