Whole-Field Experimental Stress Analysis Using Laser Speckle Interferometry.
Abstract
The objective of this study was to develop a whole-field experimental stress analysis method for composite structures. A data-gathering system, using the optical technique of laser speckle interferometry, was used to capture deformation of bodies under load on a film record. The speckle interferograms were analyzed by a computer-aided scanning system. A mathematical and geometrical interpretation of interferometric data is presented. The interferograms were analyzed at strategic image points on the test specimens to obtain displacement data which was used to calculate strains, shearing strains, and correlated with shearing stresses. Anisotropic elastic constants such as Young's modulus, shear modulus, and Poisson's ratio were calculated. A full-field aperture analysis was used as a tool to qualitatively observe the free edge effects of shear specimens. The techniques presented in this report are significant because full-field or discrete information can be obtained from any point rather than averaging data from a small region. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 14, 1981
- Accession Number
- ADA105805
Entities
People
- Terry L. Vandiver
Organizations
- United States Army Aviation and Missile Command