Magneto-Elastic behaviour of Steels for Naval Applications

Abstract

Naval vessels become magnetized during construction and service due to the combined action of the earth's magnetic field and mechanical stress. The magnetic signature must be kept to a minimum to reduce vulnerability to magnetic mines and magnetic anomaly detection. In this work the magneto-elastic behaviours of various steels used in naval construction are compared, with particular emphasis on submarine hull steels. Magnetic field strengths of the order of the earth's field, and stresses up to 200 MPa are examined. All the steels examined have similar qualitative behaviour, but the quantitative behaviour is quite different. Mild steel is easily magnetized, HSLA80 is more difficult, and the HY steels (HY80 and HY100) more difficult again. The initial permeability of the steel is a good guide to the degree of magnetization caused by either stress or field cycling.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1991
Accession Number
ADA236054

Entities

People

  • Ian M Robertson

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Anomaly Detection
  • Chemical Analysis
  • Classification
  • Construction
  • Detection
  • Hardness
  • Magnetic Anomaly Detection
  • Magnetic Fields
  • Magnetic Properties
  • Magnetic Signatures
  • Magnetization
  • Materials
  • Measurement
  • Permeability
  • Ships
  • Submarine Hulls
  • Submarines

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy
  • Microwave Engineering.