Yield Strengths, Cycling, And Fatigue Of Materials. A Safety Factor of Two. 5-Plus Even Better.
Thermal Cycling (ie. over Water-Ice Range). And, Pressure/Stress Cycling (ie. over 0 - 6,000 Lbs per Square Inch Range). Doing It Over And Over To The Material Until Fatigue And Failure. Materials Testing, Behavior, And Cycling.
The Joints Of Dis-Similar Materials. CarbonFiber/Titanium Hull Composite. Titanium Hemisphere Endcaps. PlexiGlas Acrylic Porthole Window. Different Coefficients of Expansion (Contraction).
CarbonFiber/Titanium Composites Best Used For It's Tensile Strength (i.e. Pressure Tanks). Not Used For It's Compressive Strength Where Outside Pressure Crushing Against Inside (i.e. Submersible). Also, Composites Have Risks of De-Lamination. See Technical Expert Take & Experience Video Below!
At Seafloor, That's The Weight Of 2 Cars Per Square Inch Crushing In To Get To You. Over Each And Every Single Square Inch Of The Craft Body. Or, About The Weight of 700 Cars Crushing Against Over That 21" Round Porthole Window!
Better To Cycle Test And Rate Whatever Materials You Use From Near Zero To Ultimate Pressure Extremes.
Water Pressure:
14.70 psi at Surface
~6,000 psi at 12,500 ft Depth.
(About 1 atm/14.70 psi for every 30 ft down.)
Water Temperature:
45 F (7.2 C) at Surface Water
36.5 F (2.5 C) at Seafloor
Technical Take & Experience:
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