27 March 2012 Measurement of strain distribution in smart materials by electron Moiré method
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Abstract
A method for measuring the stress and strain distribution in composite materials and the residual stress near the interface in smart composite has been developed. The strains are measured using electron Moiré method. In this method a very fine model grid is fabricated using the optical and electron lithography techniques on the surface of the specimen and an electron beam scan of which the spaces are almost same as that of the model grid used for the master-grid. The difference in the amount of secondary electrons per a primary electron produces the Moiré fringes that consist of bright and dark parts. The residual strain and stress around the fibers of the smart composite materials and thermal expansion ratio of a fiber and Al matrix were measured by this method.
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S. Kishimoto, H. Asanuma, Y. Tanaka, Y. Kagawa, "Measurement of strain distribution in smart materials by electron Moiré method", Proc. SPIE 8341, Active and Passive Smart Structures and Integrated Systems 2012, 83411J (27 March 2012); doi: 10.1117/12.915118; https://doi.org/10.1117/12.915118
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