PREDICTIONS OF THE COLLAPSE STRENGTH OF THREE HY-100 STEEL SPHERICAL HULLS FABRICATED FOR THE OCEANOGRAPHIC RESEARCH VEHICLE ALVIN.

Abstract

Out-of-roundness measurements were taken on three spherical pressure hulls which have been fabricated for ALVIN, a two-man oceanographic vehicle designed for an operating depth of 6000 ft. The results of these measurements indicated that over a critical arc length, the maximum ratio of local radius to nominal radius was 1.05. The collapse strength of the three hulls was evaluated by means of a recently developed analysis which utilizes local geometry as determined by out-of-roundness measurements. Based on critical local geometry and available stress-strain curves, the analysis indicated that the collapse depths of the hulls ranged from approximately 15,000 to 16,000 ft. A high degree of confidence is placed in the results, and the importance of accurately measuring the shape of spherical shells is emphasized. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1964
Accession Number
AD0601094

Entities

People

  • Thomas J. Kiernan

Tags

DTIC Thesaurus Topics

  • Collapse
  • Crush Depths
  • Geometry
  • Measurement
  • Mechanical Properties
  • Physical Properties
  • Pressure Hulls
  • Stress Strain Relations
  • Stresses
  • Submarine Hulls
  • Vehicles

Readers

  • Fluid Dynamics.
  • Marine Hydrodynamics
  • Structural Dynamics.