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[QUOTE]Originally posted by Shipbuilder: [QB] A fairly constant internal pressure load wouldn't be that big of a problem, you simply pick a material that has a yield strength above that constant load (viable with today's materials). The difficulty involves a changing pressure differential, either externally or internally. Most aircraft for instance have a set internal pressure, but they are forced to contend with varying external pressures as altitude increases. In effect, the aircraft is constantly contracting or expanding in flight (something to think about on your next flight). This in turn causes the materials to be subjected to fatigue stresses which CAN and DO cause failure below the material's yield strength. Starships that do not regularly land on planets with atmospheres should only have to contend with the constant internal pressure vs. space vacuum condition and should be easily (from a materials standpoint) designed to meet these conditions. Those that can land probably have factors of safety and routine inspections, just as aircraft of today do, to ensure that the contracting/expanding loads do not initiate a crack. [/QB][/QUOTE]
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