The effect of sea water exposure on the interfacial fracture of some sandwich systems in marine use

Kolat, Koray; Neşer, Gökdeniz; Özes, Çiçek

doi:10.1016/j.compstruct.2006.01.009

Cited by 29 publications

(17 citation statements)

References 8 publications

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“…Experimental results showed a decrease in tensile modulus, tensile strength, and fracture toughness after exposure to ambient temperature and humidity. A similar response in sandwich structures is also found by Kolat et al , Siriruk et al , and Scudamore and Cantwell .…”

Section: Introductionsupporting

confidence: 86%

Multi‐scale analysis of diffusion of fluid in sandwich composites

et al. 2019

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This study presents a multiscale analysis for describing the fluid diffusion in polymeric sandwich composites, comprising of glass-epoxy fiber reinforced polymer (FRP) skins and polyurethane foam core. The multiscale framework includes the unit-cell micromechanics model for determining the overall diffusion behavior in the FRP skins by incorporating different diffusivities of the fiber and matrix and the diffusion model for foam core. In addition, multiscale diffusion tests have been conducted for the sandwich composites, FRP skins, foam core, and epoxy resin. The specimens were immersed in deionized water at 50 C. The capability in predicting the overall diffusion behavior of sandwich composites while recognizing the different diffusion processes of the constituents is not only beneficial for designing polymeric sandwich composites with desired performance but also enhances understanding on the durability of polymeric sandwich composites. POLYM. COMPOS., 40:3520-3532, 2019.

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Section: Introductionsupporting

confidence: 86%

Multi‐scale analysis of diffusion of fluid in sandwich composites

et al. 2019

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“…Since there is no ASTM standard of DCB mode-I fracture test for foam-cored sandwich composites, ASTM D5528–13 [21], D3433–99 [22], and references [23–25] were adopted as the guidelines for sandwich DCB mode-I fracture test. The nominal dimensions of PU sandwich specimens are 254 mm × 39.2 mm × 55.9 mm (length × width × thickness); the detailed DCB configuration is illustrated in Figure 4.…”

Section: Experimental Methodologymentioning

confidence: 99%

Effect of salt water exposure on foam-cored polyurethane sandwich composites

Huo

Mohamed

Nicholas

et al. 2018

Jnl of Sandwich Structures & Materials

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This study investigated the effect of moisture absorption on the mechanical performance of polyurethane sandwich composites. The core material was a closed cell polyurethane foam. Face sheets were made of E-glass/polyurethane composite laminates. Vacuum-assisted resin transfer molding process was used to manufacture specimens for testing. The foam core, laminates, and sandwich composites were submerged in salt water for prolonged periods of time. Mechanical property degradation due to moisture absorption for each constituent was evaluated. Compression test was performed on the foam core samples. Laminates were evaluated by three-point bending tests. The interfacial bond strength in the sandwich structure was evaluated by double cantilever beam mode-I interfacial fracture test. The testing results revealed that the effect of salt water exposure on the compressive properties of the foam core is insignificant. The flexural modulus of polyurethane laminates degraded 8.9% and flexural strength degraded 13.0% after 166 days in 50% salinity salt water at 34°C conditioning. The interfacial fracture toughness of polyurethane sandwich composites degraded 22.4% after 166 days in 50% salinity salt water at 34°C conditioning.

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“…Because in polymeric sandwich structures with closedcell foam materials, there is an interface between two dissimilar materials with different properties, debonding is of significant importance when such materials are exposed to sea water [11][12][13][14]. The interfacial debond toughness of sandwich structures in terms of the critical energy release rate has been studied in various types and thicknesses of foam materials [10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Seawater and Low Temperatures on Polymeric Foam Core Material

2011

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Polymeric composite sandwich structures, often manufactured using a thick foam core material and thin composite facings, are of significant interest in naval applications. This paper summarizes the coupled effect of sea water and low temperature on the mechanical properties of closed cell polymeric H100 foam core material. The study considers the effects of harsh sea environmental conditions on the fracture and deformation behavior of such a foam material under complex loading conditions that include tension, torsion, compression, and true-triaxial stress paths. Mechanical testing techniques are developed using coupon samples of suitable geometry that minimize grip effects on these low density complex foam materials, along with information associated with the observed cross-anisotropic behavior. Interfacial delamination fracture response for the sandwich structures due to the combined effects of sea water and low temperature are evaluated and the associated degradation in critical energy release rate for delamination is found to be substantial. Experimental data for H100 foam cores associated with moisture induced expansional strains are also included.

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The effect of sea water exposure on the interfacial fracture of some sandwich systems in marine use

Cited by 29 publications

References 8 publications

Multi‐scale analysis of diffusion of fluid in sandwich composites

Multi‐scale analysis of diffusion of fluid in sandwich composites

Effect of salt water exposure on foam-cored polyurethane sandwich composites

Effects of Seawater and Low Temperatures on Polymeric Foam Core Material

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