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Abstract

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.

Keywords

short-beam shear (SBS) test digital image correlation (DIC)polymer-matrix composites (PMCs)shear strength delamination stress/strain curves.

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References

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A Test Method for Assessment of Shear Properties of Thick Composites

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