A New Optical Technique for Rapid Determination of Creep and Fatigue Thresholds at High Temperature.

Abstract

A laser-based interferometric displacement gage was used to measure crack opening displacements very near the tips of fatigue precracks. The test material was Inconel 718 and the temperature 650C. Creep and fatigue cracking thresholds were determined in times as short as one-half hour and found to be approximately 11 MPa-m to the 1/2 power in both cases. Details of the measurement technique as well as of the displacements measured near the tip are given. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1984
Accession Number
ADA142675

Entities

People

  • W. N. Sharpe Jr.

Organizations

  • Johns Hopkins University

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Calibration
  • Cracks
  • Creep
  • Fatigue Tests (Mechanics)
  • Governments
  • High Temperature
  • Intensity
  • Laser Beams
  • Load Cells
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Materials Science
  • Measurement
  • Mechanics
  • Reliability
  • Three Dimensional

Readers

  • Materials Science (Mechanical Engineering).

Technology Areas

  • Directed Energy