A Laser Interferometric Technique for Crack Surface Displacement Measurement,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
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.
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods