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Abstract

Several design concepts for the pressure container used in hydrostatic extrusion and other processes were analysed for maximum pressure capability. Multi-ring, segmented-ring, and fluid-pressure-supported containers with bore fluid pressures fluctuating between zero and peak pressures up to 450 000 lbf/in² at temperatures of 70°F, 500°F, and 100°F were considered.

Fatigue strength was the basis of the analysis. Stresses due to bore pressure and shrink fit were determined. The effect of temperature changes was included. Elasticity solutions for stresses and displacements were used together with fatigue relations to determine formulas for pressure-to-strength ratios as functions of geometry. These were programmed for computer calculation.

Pressures up to 1 000 000 lbf/in² are theoretically possible in some designs. However, theoretical pressures are not practicable because of manufacturing, and assembly size limitations. These limitations restrict maximum pressures to 300 000 lbf/in² for multi-ring and segmented containers. A new design, a combination of two multi-ring containers with a fluid-supporting pressure in between, is suggested which is not so restricted. It makes use of the benefits of both fluid-support pressure and prestress from shrink fit. Maximum pressures of 450 000 lbf/in² and higher can be practicably achieved with this design.

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Paper 34: Analysis of Several High Pressure Container Design Concepts

Abstract

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References