Flexural Testing of Composite Sandwich Structures with Digital Speckle Photogrammetry

Fergusson, Alexander; Puri, Amit; Morris, Andrew M.; Dear, John P.

doi:10.4028/0-87849-418-9.135

Cited by 2 publications

(2 citation statements)

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“…Yang et al [16] have tested several materials and concluded that DIC can measure true strain at any point in the specimen, while the average strain should be obtained with the traditional methods. Fergusson et al [17] showed that the DSP provides meaningful strain measurement for composite sandwich structures and further work is needed. Thus, displacements and strain-full-field determination across and through sandwich panels is necessary and more studies are deemed necessary.…”

Section: Introductionmentioning

confidence: 99%

Flexural testing and analysis of full-strain-fields in sandwich composites

Marat-Mendes

Martins

Garcia

et al. 2019

Frattura Ed Integrità Strutturale

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The objective of this work was to characterize the full-field flexural behavior of composite sandwich beams. Finite element analysis was used to estimate the behavior of sandwich beams under three-and four-pointbending tests and were compared with experimental results obtained via digital image correlation and strain-gauges. Two different polyurethane core thicknesses and two different sandwich lengths were used to simulate shortand long-beam. Two distinct sandwich beams were used by means of two different faces: aluminum and basalt fiber reinforced polymer composite. Fullstrain-fields and flexural displacements results were obtained showing that BFRP sandwiches exhibited higher flexibility and higher capacity of absorption energy than the aluminum specimens however with a higher prospect of core shear failure. For both face materials short-beams present higher strains than the long-beams and 4PB test specimens showed negative strain distribution in the upper side of the specimen and positive in the underside contrary to 3PB that presents positive strain distribution along the

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Section: Introductionmentioning

confidence: 99%

Flexural testing and analysis of full-strain-fields in sandwich composites

Marat-Mendes

Martins

Garcia

et al. 2019

Frattura Ed Integrità Strutturale

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“…Fiber posts consist of fibers such as carbon, quartz, silica or glass in a matrix based resin. Fergusson et al [4] used digital speckle photogrammetry technique to study the effect of defects on flexural behavior of sandwich composite structures. Composite structures are usually subjected to large flexural loadings, so the flexural behavior of these structures and their constituents are critical to their use.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Flexural Behavior and Moment Curvature Response of Epoxy Resin Using Digital Image Correlation Technique

Fard¹,

Liu²,

Chattopadhyay³

2011

JMSE-A

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The effect of local strain and stress distribution in the polymeric material under out of plane loading is of interest in many applications. Flexural testing of the epoxy resins is necessary to evaluate their mechanical behavior. In this paper, the flexural response of epoxy resin Epon E 863 and hardener EPI-CURE 3290 has been investigated in three point bending (3PB) at different strain rates. Beam specimens with rectangular cross sections, different lengths and span to depth ratios were tested at their mid point. Samples had either a quarter deep notch or a groove at their mid points. Strain fields within the beam structure were determined using digital image correlation technique. Load deflection curves at different load speeds were obtained. Limit of proportionality (LOP), modulus of rupture (MOR), initial slope of the load-deflection curve, and slope of load deflection curve after the LOP point were extracted. The nonlinear moment curvature behavior has been obtained. The results show that a digital image correlation can accurately categorize the material response of an epoxy resin for flexural loading. Results clearly display the strain rate effects on the material response.

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Flexural Testing of Composite Sandwich Structures with Digital Speckle Photogrammetry

Cited by 2 publications

References 0 publications

Flexural testing and analysis of full-strain-fields in sandwich composites

Flexural testing and analysis of full-strain-fields in sandwich composites

Nonlinear Flexural Behavior and Moment Curvature Response of Epoxy Resin Using Digital Image Correlation Technique

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