Diffusion Studies on Advanced Fibre Hybrid Composites

Gopalan, R; Rao, Raghavendra; Murthy, Madhav; Dattaguru, B.

doi:10.1177/073168448600500105

Cited by 21 publications

(7 citation statements)

References 3 publications

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“…The diffusion coefficient ( D ) is one of the important parameters of Fick’s model and shows the ability of water molecules to penetrate inside the composite structures. The values of D can be obtained from the initial slope of the plot of M t /M m against time t using the following equation 34 where…”

Section: Resultsmentioning

confidence: 99%

Studies on water absorption behaviour of bamboo–epoxy composite filled with cenosphere

Jena

Pradhan

Pandit

2014

Journal of Reinforced Plastics and Composites

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This paper deals with the evaluation of water absorption properties of natural fibre composites consisting of bamboo fibre as reinforcement, epoxy as matrix and cenosphere as particulate filler at different environmental conditions. Hand lay-up technique is used to fabricate the composites with varying number of layers of bamboo fibre and cenosphere filler content. Water absorption kinetics of the composites is presented in this paper. It is observed that the rate of water absorption depends on the fibre content as well as filler content. Addition of filler in the layered bamboo–epoxy composite decreases the moisture absorption capacity and maximum reduction is observed to be 21% and 32% for distilled and sea water conditions, respectively, in seven-layered composite with 3.0 wt% filler.

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Section: Resultsmentioning

confidence: 99%

Studies on water absorption behaviour of bamboo–epoxy composite filled with cenosphere

Jena

Pradhan

Pandit

2014

Journal of Reinforced Plastics and Composites

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“…Gopalan et al. [20] observed that moisture diffusion in both simple and hybrid unidirectional fiber-reinforced composites exposed to water immersion conditioning correlated well with analytical Fickian diffusion plots. However, classical Fickian diffusion model is not always adequate in predicting the moisture diffusion behavior in polymers or polymer composites in many circumstances.…”

Section: Introductionmentioning

confidence: 87%

Experimentation and simulation of moisture diffusion in foam-cored polyurethane sandwich structure

Huo

Mohamed

Nicholas

et al. 2015

Jnl of Sandwich Structures & Materials

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The moisture diffusion behavior of two-part thermoset polyurethane neat resin, woven E-glass fiber-reinforced polyurethane face sheet, closed-cell rigid polyurethane foam core and their corresponding sandwich specimens was investigated in this study. The vacuum-assisted resin transfer molding process was used to manufacture the polyurethane sandwich panels. Open-edge moisture diffusion experiment was conducted for sandwich panel and its constituents by immersing each type of samples in distilled water at room temperature for nearly seven months. Moisture diffusivities and solubility for neat resin, face sheet and foam core specimens were characterized according to the experimental analysis. The moisture diffusion behavior for closed-cell polyurethane foam was found to deviate significantly from classical Fick's law, and a multi-stage diffusion model was thus proposed to explain this deviation using a time-dependent diffusivity scheme. A user-defined subroutine was developed to implement this scheme into the commercial finite element analysis code ABAQUS. A three-dimensional dynamic finite element model was developed to predict the moisture diffusion behavior in neat resin, face sheet, foam core and sandwich specimens. This finite element model was then validated by comparing simulation results with experimental findings.

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“…It is well known that moisture and temperature degrade the performance of organic matrix composites such as graphite, Kevlar and boron reinforced epoxy [7][8][9][10][11][12][13]. Similar data for hybrid composites are very limited in literature [14][15][16][17].…”

Section: Introductionmentioning

confidence: 98%

Moisture and Temperature Induced Degradation in Tensile Properties of Kevlar-Graphite/Epoxy Hybrid Composites

Haque

Mahmood

Walker

et al. 1991

Journal of Reinforced Plastics and Composites

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This paper presents results of a comparative study of the effects of moisture and temperature on tensile properties of Kevlar 49/epoxy, graphite/epoxy, single fiber and Kevlar 49-graphite/epoxy hybrid composites. The work reported here shows variations in tensile strength, elastic modulus and Poisson's ratio with changes in the hygrothermal conditions. A temperature range of 23°C to 150°C was considered for both dry and wet specimens exposed to moisture for 200 days. Moisture was introduced into the specimen by immersion in distilled water. Effects of the kind of outer fiber of the same hybrid system was also studied for better understanding of the behavior of hybrid composites. Variation in the tensile modulus determined by various test methods is also reported.The results indicate that moisture and temperature degrade the tensile strength of hybrid and single fiber composites. The tensile modulus of Kevlar 49-graphite/epoxy is comparatively higher than that of Kevlar 49/epoxy. The degradation of the tensile modulus is mostly temperature dependent. The presence of moisture either increases or decreases the tensile modulus depending upon the laminate and exposure conditions. Poisson's ratio in general appears to increase with temperature. In the presence of moisture the Poisson's ratio further increases between the temperatures of 45°C to 150°C.

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Diffusion Studies on Advanced Fibre Hybrid Composites

Cited by 21 publications

References 3 publications

Studies on water absorption behaviour of bamboo–epoxy composite filled with cenosphere

Studies on water absorption behaviour of bamboo–epoxy composite filled with cenosphere

Experimentation and simulation of moisture diffusion in foam-cored polyurethane sandwich structure

Moisture and Temperature Induced Degradation in Tensile Properties of Kevlar-Graphite/Epoxy Hybrid Composites

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