Strain Distributions in Bonded Composites Using Optical Fibers and Digital Image Correlation

Saha, Shuvam; Sullivan, Rani W.

doi:10.12783/asc34/31415

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…Turning to the comparison of DIC and FBG measurements, Figure 11a,b shows the evolution of longitudinal strain obtained from FBG sensors and DIC inspection blocks located on the composite skin and steel surface adjacent to adhesive. The results show functional coherence between both types of measurements, in line with the observations reported in Saha and Sullivan [41] for composite joints and in Jaiswal et al [43] for multi-material joints.…”

Section: Fbg Measurement Of (Longitudinal) Strainsupporting

confidence: 91%

“…Xavier et al [ 40 ] used DIC and an embedded FBG sensor to measure external and internal strain in the epoxy adhesive of wooden double cantilever beam specimens. Saha and Sullivan [ 41 ] recorded the longitudinal surface strain distribution for a composite double‐lap shear joint subjected to a tension test by means of embedded FBG sensors (at adhesive–adherend interface and in the bulk adhesive) and DIC. Manterola et al [ 42 ] monitored mode I crack growth in double cantilever beam specimens bonded with rigid methacrylate adhesive and silicone‐based flexible adhesive using embedded FBG sensors, DIC, back‐face strain gauges, ultrasonic inspection and acoustic emission sensors.…”

Section: Introductionmentioning

confidence: 99%

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Experimental deformation analysis of an adhesively bonded multi‐material joint for marine applications

Jaiswal

Kumar

Juwet³

et al. 2023

Strain

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The strength and deformation of full-scale adhesively bonded multi-material joints is studied in this paper. Four joints with a thick layer of methyl methacrylate adhesive (MMA) have been manufactured in shipyard conditions. In two specimens, cracks have been introduced at steel-adhesive and compositeadhesive interfaces. One cracked and one un-cracked specimen were subjected to quasi-static tensile testing; the two remaining specimens were stepwise loaded/unloaded with increasing load until failure. The strain in the adhesive layers was measured with digital image correlation (DIC). This showed a predominant shear deformation and dissimilar shear strain patterns for different bond lines. Fibre Bragg (FBG) sensors were used to monitor strains at steel and composite constituents and to detect the onset and evolution of damage in the un-cracked specimen. Strains measured by FBG sensors correspond well with DIC results at nearby regions. All specimens failed by delamination of the composite panel near the composite-adhesive interface.

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Section: Fbg Measurement Of (Longitudinal) Strainsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Experimental deformation analysis of an adhesively bonded multi‐material joint for marine applications

Jaiswal

Kumar

Juwet³

et al. 2023

Strain

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“…The maximum strain peak observed at this point of the test was about 800 µε and can be associated with the beginning of the bonded region, according to Saha et al [43]. Each curve represents the strain profile recorded at a specific load level reached during the test.…”

Section: Obr Measurementsmentioning

confidence: 80%

Experimental analysis of mode I crack propagation in adhesively bonded joints by optical backscatter reflectometry and comparison with digital image correlation

Lima

Perrone

Carboni

et al. 2021

Theoretical and Applied Fracture Mechanics

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“…117,119 Maintenance of such tanks is difficult, with special care needed for the structural health monitoring of bonded composite joints. Lap-shear joints formed in such applications develop large out-of-plane peel stresses 120,121 and undergo a significant reduction in ultimate strength. 122,123 Moreover, metal liners add to the overall weight and reduce the amount of usable cryogenic fuel.…”

Section: Methods To Reduce Permeabilitymentioning

confidence: 99%

A review on gas permeability of polymer matrix composites for cryogenic applications

Saha,

Sullivan

2024

Journal of Composite Materials

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Fiber-reinforced polymer matrix composites are increasingly considered for lightweight cryogenic pressure vessels due to their excellent combination of tailorability, specific mechanical properties, and relatively low coefficients of thermal expansion. However, significant challenges must be overcome to fully utilize PMCs for cryogenic fuel tanks in terms of transverse microcracking and subsequent permeation of cryogenic fuel. Gas permeation and microcrack densities of cryogenically cycled composites are highly influenced by their layup, ply thickness, load case, and manufacturing defects like voids and resin rich zones. There has been a significant amount of research on measuring gas permeation of composites fatigued under pure thermal or uniaxial thermo-mechanical stresses. However, results demonstrate that the gas permeability should be measured under biaxial thermo-mechanical stresses to properly gauge the leakage characteristics of damaged composites. This paper summarizes the results from over a hundred papers on the key parameters that influence the gas permeability of composites, appropriate testing methods to cycle composites for permeability measurement, methods to limit the evolution of transverse microcracks, and materials traditionally used for the fabrication of all-composite cryogenic fuel tanks. Thin plies and nanofiller-toughening of the matrix have been shown to provide significant improvements in transverse microcrack suppression within cryogenically cycled composites.

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Strain Distributions in Bonded Composites Using Optical Fibers and Digital Image Correlation

Cited by 9 publications

References 6 publications

Experimental deformation analysis of an adhesively bonded multi‐material joint for marine applications

Experimental deformation analysis of an adhesively bonded multi‐material joint for marine applications

Experimental analysis of mode I crack propagation in adhesively bonded joints by optical backscatter reflectometry and comparison with digital image correlation

A review on gas permeability of polymer matrix composites for cryogenic applications

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