Abstract
The grating objective speckle method has been applied in whole-field strain analysis of carbon-fiber-woven polyimide-composite materials. A sequence of rosette fringe patterns was obtained from one single specklegram, indicating displacement components along four different directions with a 45-deg interval. The spatial frequencies, which represent the sensitivities of the fringe intervals, were 2400 ℓ/mm forU x ,U y and 1697 ℓ/mm forU 45 andU 135. Normal strain components, ɛ x , ɛ y , ɛ45, and ɛ135, were trasformed to quantitative topographic representations by coupling to a digital computer system. Shear strain can be determined by the rosette equations.
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Tu, M., Gielisse, P.J. & Xu, W. Application of the grating objective speckle method to composite materials. Experimental Mechanics 32, 83–88 (1992). https://doi.org/10.1007/BF02317991
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DOI: https://doi.org/10.1007/BF02317991