Abstract
This paper analyzes the side space’s impact on deformation and stress of the inner pressure tank shell under different load cases, depending on the stress law of the outer pressure tank. The results indicate that: the smaller side space is good for the longitudinal stress at the shell above the pressure tank under two conditions. As the side space increases, the stress decreases. The stress’s changing law of the inner pressure tank’s shell is the same with the outer. However, the changing law of the hull’s stress is different. The stress computational formula of the outer pressure tank can’t be applied to the inner directly and it need be modified.
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