English

DTIC ADA592293: PRHDEF - Stress and Stability Analysis of Ring Stiffened Submarine Pressure Hulls

Preliminary investigation of the structural integrity of a submarine pressure hull can be accomplished by the use of design formulae. Approximate solutions for stress and stability of uniformly stiffened cylinders subject to hydrostatic pressure have been assembled and incorporated in the computer code PRHDEF. The British pressure vessel code, BS5500, and other codes have been used where appropriate. Critical pressures are determined for yielding in the frames and shell, for interframe and overall bifurcation buckling and for collapse of the stiffened shell and endcap. The effect of out of circularity on frame failure is considered and dimension checks for stiffener tripping are made. The background and limitations of the various equations are discussed and results are compared with those obtained using the axisymmetric finite difference program BOSOR4. The methods described in this report are particularly useful for comparison of various design alternatives on a common basis and for preliminary investigation before more complex and costly finite element or finite difference analyses are undertaken.

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