Accession Number:

AD0744489

Title:

A Study of the Parameters Associated With Employing Laser Speckle Correlation Fringes to Measure In-Plane Strain

Descriptive Note:

Technical rept. Dec 1971-Feb 1972

Corporate Author:

AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s):

• Adams, Frank D.

Report Date:

1972-03-01

Pagination or Media Count:

28.0

Abstract:

Basic experimental parameters associated with using laser speckle correlation fringes to measure in-plane strain have been investigated. Equations and inequalities are derived which provide bounding numbers for many of the physical parameters. The feasibility of employing this technique for obtaining in-plane strain data in a microscopic region is shown. This suggests that it may be applicable for studying strain distributions in the vicinity of either a crack or an interference fit fastener.

Descriptors:

• *NONDESTRUCTIVE TESTING
• *STRAIN(MECHANICS)
• *AIRFRAMES
• REAL TIME
• FEASIBILITY STUDIES
• STEREOPHOTOGRAPHY
• PHOTOGRAPHY
• LASERS
• TEST METHODS

Subject Categories:

• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE