Accession Number:

ADA001621

Title:

A Laser Interferometric Technique for Crack Surface Displacement Measurement,

Descriptive Note:

Corporate Author:

AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO

Report Date:

1974-07-01

Pagination or Media Count:

33.0

Abstract:

The opening of a fatigue crack in an aluminum specimen was measured by optical interference from single grooves ruled on both sides of the crack. Displacement can be measured with a sensitivity of 0.1 micron, making the technique particularly useful in studies of crack closure. Details of this easy, inexpensive technique are discussed in this report.

Subject Categories:

  • Metallurgy and Metallography
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE