Abstract
Accurate determination of Young’s Modulus of materials is important for structural design, analyses, as well as for quality control. The intricacies involved in such experiments are generally related to the accurate measurement of strains in the elastic region. For metals and composite laminates, the problem is generally dealt with the use of extensometers or strain gages. In case of fiber tows, such simple solution is often restricted by the small specimen size and low bending rigidity of the specimen. This paper presents an alternative approach for the determination of in-plane Young’s modulus of these materials by using Digital Image Correlation (DIC). Uniaxial tensile experiments were performed with specimens made of aluminum alloy, E-Glass/Polyester laminate and carbon fiber tows with strain measurement done through an indigenously developed two dimensional DIC algorithm in MatLab. The strain measurements were validated for aluminum alloy and composite specimens by using foil-type electric resistance strain gages. The elastic modulus computed with these strain values were then compared with literature data. The comparison shows good agreement with the reference values. The proposed technique offers a quick, costeffective and widely adaptable alternative of traditional methods for determination of elastic modulus of both homogeneous as well as heterogeneous materials.

M. Zeeshan Siddiqui, Fawad Tariq, Nausheen Naz, M. Fahad Ahmed. (2012) Determination of Young’s Modulus of Metallic and Composite Materials by Digital Image Correlation, Journal of Space Technology , Volume 2, Issue 1.
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