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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