Plastic collapse of ellipsoidal head pressure vessels is considered. The heads have an inside semimajor axis to semiminor axis ratio of 2:1. Diameter to thickness ratios (D/t) vary from 20–2000. Calculations are performed based upon the von Mises yield criterion. Previous results based upon the Tresca yield criterion are included for comparison. The combined results give reasonably close bounds on the plastic collapse pressure (limit pressure) over the large range of D/t.

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