NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
edge effects in composites by moire interferometryThe very high sensitivity of moire interferometry has permitted the present edge effect experiments to be conducted at a low average stress and strain level, assuring linear and elastic behavior in the composite material samples tested. Sensitivity corresponding to 2450 line/mm moire was achieved with a 0.408 micron/fringe. Simultaneous observations of the specimen face and edge displacement fields showed good fringe definition despite the 1-mm thickness of the specimens and the high gradients, and it is noted that the use of a carrier pattern and optical filtering was effective in even these conditions. Edge effects and dramatic displacement gradients were confirmed in angle-ply composite laminates.
Document ID
19830046858
Document Type
Reprint (Version printed in journal)
Authors
Czarnek, R.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Post, D.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Herakovich, C.
(Virginia Polytechnic Institute and State University Blacksburg, VA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Experimental Techniques
Volume: 7
Subject Category
STRUCTURAL MECHANICS
Funding Number(s)
CONTRACT_GRANT: NSF MEA-81-092230
CONTRACT_GRANT: NCC1-15
Distribution Limits
Public
Copyright
Other