Main Pressure Vessel
Dimensions:
Material: Acrylic
Maximum Compressive Strength: 95 MPa
Radius: 5 inches
Length: 2 ft
Thickness: 1/8 ft
Hoop Stress vs Axial Stress
So the concern with the durability of the pressure vessel was that it would not hold under 80 feet of water. This is equivalent to 35 PSI under gauge pressure (As opposed to 49.7 psi in absolute pressure). Using calculations from Hibbeler,
σ=pr/t
where p is pressure,
r is radius of the entire cylindrical enclosure
t is the thickness of the walls
σ = (35 lbf/in^2)*5 in/.125in
σ = 1400lb/in^2 = 1.4 ksi
1.4 ksi = 9.6 MPA
9.6 MPA << 95 MPA Compressive Strength
There is a safety factor of about 10 on the cylinder, which will be fine.
Citation: Hibbeler Statics and Mechanics of Materials, 3rd Edition. R.C. Hibbeler.
Goals
Background and strategic fit
Assumptions
Requirements
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User interaction and design
Questions
Below is a list of questions to be addressed as a result of this requirements document:
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