"Under Pressure" Design Software:

Features:

• Design loop allows variation of single parameter
• Calculates both thin wall and thick wall collapse pressures
• Equations from Roark and Young's Formulas for Stress and Strain

"Under Pressure" is an engineering design tool to aid in the design of pressure housings and pressure vessels. This program was under development for over two years and is used extensively for DeepSea's R&D and contract engineering. Designed to be used by the working engineer or scientist, this menu-driven software is interactive and user friendly. A large materials database is provided that can be expanded by the user.

Choose the material, housing component geometry, and pressure analysis range; the stress analysis is then rapidly calculated. A design loop can be selected and the analysis can be repeated while a single parameter (e.g. wall thickness) is varied. Stresses and deflections are given for internal or external pressures, over a user-selectable pressure range. Where appropriate, both thin wall (elastic instability) and thick wall collapse pressures are calculated. Results are given for tubes, hemispheres, spheres, and flat circular plates (with and without a center hole). A choice of possible endcap boundary conditions is given: simply supported, fixed, guided, and free.

Air and seawater weights are calculated for each housing component chosen. English or metric units can be specified. The program uses equations from Formulas for Stress and Strain, sixth edition, by Raymond J. Roark and Warren C. Young. Hardware Requirements: IBM PC or compatible with minimum 640K memory, monochrome monitor. A hard disk is strongly recommended.