Restrictions on the Ratio of Normal to Tangential Field Components in Magnetic Rubber Testing

Abstract

Magnetic Rubber Testing (MRT) is an extremely sensitive method for deteckng surface-breaking cracks in ferromagnetic materials, and is used extensively in critical inspections for D6ac steel components of the F-111 aircraft. This report documents a series of experiments, performed to investigate the effect of normal versus tangential magnetic field components in MRT. The results conflrm that excessive levels of normal (perpendicular) magnetic field in active-field MRT procedures can cause distortion, weakening or masking of indications from fatigue cracks. Consequently, recommendations are made for the restriction of normal field levels in the development of active-field MRT procedures. This work does not deal with residual-field MRT, and the supplied herein are not transferable to residual-field measurements.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2007
Accession Number
ADA473783

Entities

People

  • M. E. Ibrahim
  • S. K. Burke

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Data Sets
  • Detection
  • Distortion
  • Ferromagnetic Materials
  • Inspection
  • Magnetic Fields
  • Magnetic Flux
  • Materials
  • Measurement
  • Permanent Magnets
  • Platforms
  • Reliability
  • Residuals
  • Sensitivity
  • Standards
  • Statistical Analysis

Fields of Study

  • Physics

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