The Development of Quantitative NDI for Retirement-for-Cause.

Abstract

To investigate the viability of quantifying NDI signals, relationships between eddy current signals and flaw dimensions were examined. The prime emphasis of this report is exploring these relationships and the difficulties encountered in establishing them. A fracture mechanics/NDI-based disk rejection criteria, retirement-for-cause, which required quantitative NDI, is also described. The case of radially cracked bolt holes in a turbine disk inspected by a semiautomatic eddy current technique is used to illustrate the procedures. Monotonically increasing relationships, primarily logrithmic in nature, were observedd between signal characteristics and the dimensions of EDM notches which were used to model actual cracks. Sensitivity level and eddy current system choice were observed to significantly affect the eddy current/flaw dimension relationships. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1979
Accession Number
ADA068403

Entities

People

  • J. E. Allison
  • J. M. Hyzak
  • W. H. Reimann

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Aeronautical Laboratories
  • Air Force
  • Air Force Facilities
  • Aspect Ratio
  • Crack Propagation
  • Eddy Currents
  • Engine Components
  • Engines
  • Fracture (Mechanics)
  • Gas Turbines
  • Geometry
  • Materials
  • Materials Laboratories
  • Mechanics
  • Standards
  • Test Methods
  • Turbines

Readers

  • Radar Systems Engineering.
  • Structural Health Monitoring of Composite Structures.
  • Theoretical Analysis.