FAILURE ANALYSIS OF LIFT PAD STUDS FOR THE RECOVERY OF OBJECTS FROM THE OCEAN

Abstract

The report describes the application of failure analysis to a Naval Problem regarding the recovery of underwater objects. A lifting pad is attached to the object to be recovered by four studs which are explosively driven through undersized pad eyes into the submerged structure. Experimental trials by the Naval Ordnance Laboratory using a shock resistant tool steel for the studs resulted in breaking stresses of the order of 30,000 psi, far short of the tensile strength of 290,000 psi. NRL was asked to examine the stud failures. KIc and KIscc measurements were made on several unfailed studs. Recommendations include the use of another more suitable, non-ferrous alloy or as a minimum requirement lowering the tensile strength of the steel now used.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1968
Accession Number
AD0676198

Entities

People

  • Herschel L. Smith
  • Hugh E. Romine
  • Joseph A. Kies

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Human Systems

DTIC Thesaurus Topics

  • Alloys
  • Chemistry
  • Corrosion
  • Failure Analysis
  • Hydrogen Embrittlement
  • Iron Alloys
  • Materials
  • Materials Science
  • Mechanics
  • Molybdenum
  • Pull Tests
  • Salt Water
  • Sea Water
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Tensile Strength
  • Tool Steel

Readers

  • Explosive Engineering.
  • Structural Health Monitoring of Composite Structures.
  • Systems Analysis and Design