Hi, I am looking for a method to analyze stress within a flexible fuel tank, akin to the one in the picture: http://image.made-in-china.com/2f0j00pBiEqWDJnVbe/Flexible-Fuel-Tank-KSD-009-.jpg So far I have not been able to find a text that would discuss something similar. Simple hydrostatics do not apply if the tank is filled to a point where there is pressure head at the top of the tank. I would also like to be able to derive the cross section geometry of the tank, but that is not necessary. I would very much appreciate any pointers to any useful reading material. Thanks!