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A Test Method for Assessment of Shear Properties of Thick Composites
1 School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA, USA
* To whom correspondence should be addressed. E-mail: andrew.makeev{at}aerospace.gatech.edu.
Transverse stress–strain constitutive relations are required for structural analysis of thick-section composites. A standard technique for assessment of transverse shear properties is the V-notched beam method. Such technique is based on strain gage measurements, which require a large specimen thickness for strain gage placement and impose tight geometry tolerances to minimize variations of strain at the gage location. A full-field strain measurement capability could enable simpler test specimen designs. A method for assessment of shear stress–strain relations using a short-beam shear (SBS) test and a digital image correlation (DIC) technique is presented in this work. The DIC technique is based on quantifying locations of a random texture on a surface to measure surface shape and deformation. V-notched-beam and SBS test results are compared for a glass/epoxy tape composite. To illustrate accuracy of SBS stress calculations, finite element results are obtained. Highly nonlinear interlaminar stress–strain relations are documented.
First published on October 6, 2009 |
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