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Re: [PSUBS-MAILIST] Fiberglass Hull
There are more to it than just a percentage ratio between a cylinders
capability to withstand internal and external pressure. For example:
A long thin cylinder is capable of taking 100 bar internal pressure.
The external pressure this could handle would vary by it's length.
Also what kind of caps in the ends would matter a great deal.
There are standards that tells you how to calculate this in a proper
way. never guess !!!
For steel hulls: ABS rules building and classing underwater vehicles
On 1/26/07, djackson99@aol.com <djackson99@aol.com> wrote:
I know it's an old topic but I have mostly ignored the previous post
regarding fiberglass because I never thought I was going to give it a second
thought. ...wrong again.
1) Did anyone ever come up with a way to calculate even a ball-park working
depth given all, or at lease some of the variables for fiberglass
construction? If so can you point me in that direction?
2) I know that the externally loaded working psi for a non-reinforced
cylinder is lower than it's internal working psi. That makes even more
scene to me when thinking about the alignment and tensile strength of glass
or carbon fibers compared to their compression strength. However it seems
that there would be a ratio that could be used to estimate the reduction in
loading ability. Would that be true? For example if pipe section is rated
for 1000psi, could it's external load psi rating be stated as x% lower, say
20% lower, based on the type of material?
Thanks --Doug J
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Vennlig hilsen
Øystein Skarholm
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