the breaking of glass
DESCRIPTION
The Breaking of Glass. Strobe 6: Friday 10am–1pm [email protected] Adam Seering [email protected] Aubrey Tatarowicz [email protected] Daniel Hernandez [email protected] John Hawkinson [email protected]. Strobe 6 Final Project. We want to characterize how glass breaks. - PowerPoint PPT PresentationTRANSCRIPT
The Breaking of Glass
Strobe 6 Final Project
Strobe 6: Friday 10am–1pm [email protected]
Adam Seering [email protected]
Aubrey Tatarowicz [email protected]
Daniel Hernandez [email protected]
John Hawkinson [email protected]
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?
Basic HSV Setup
A look at the Grid and Diffuser
Edge Illumination for Viewing Cracks
Results for Crack Formation
Phantom. 50 mm lens. 75,000fps. aperture = f/1.8. 4 pumps on BB gun.
Analysis of Crack
Formation
Data Points CollectedDistance from BB impact (in mm)
Crack # Blue dot Green dot
Yellow dot
1 n/a 43 61
2 9.6 38 n/a
3 11 46 n/a
4 n/a 39 44
5 12 36 45
6 n/a 41 n/aCollected data in pixels and used the following to convert to mm: 178 pixels = 25mm
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.
Grid points before impact
0
50
100
150
200
250
300
0 100 200 300 400 500
Grid points before impact
0
50
100
150
200
250
300
0 100 200 300 400 500
Movement of grid points
0
5
10
15
20
25
30
0 50 100 150 200 250 300
Initial distance from origin (px)
Dis
tan
ce m
ove
d (
px)
Histogram of movement
0
5
10
15
20
25
30
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Frequency (1px bins)
Dis
tan
ce m
ove
d (
px)
Grid points before impact (1)
0
50
100
150
200
250
300
0 100 200 300 400 500
Y1
Grid points during impact (2)
0
50
100
150
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250
300
0 100 200 300 400 500
Grid points during impact (3)
0
50
100
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300
0 100 200 300 400 500
Movement of grid points (1-2)
0
5
10
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25
0 50 100 150 200 250 300
Distance from impact (px)
Dis
tan
ce m
ove
d (
px)
Movement of grid points (2-3)
0
5
10
15
20
25
0 50 100 150 200 250 300
Distance from origin (px)
Dis
tan
ce m
ove
d (
px)
Movement of grid points (1-3)
0
5
10
15
20
0 50 100 150 200 250 300
Distance from origin
Dis
tan
ce m
ove
d
M1-3
Velocity of grid points (1-3)
0
100000
200000
300000
400000
500000
600000
700000
0 50 100 150 200 250 300
Distance from origin (px)
Sp
eed
(p
x/se
c)