Moisture absorption of unidirectional hybrid composites

The study is focused on the water diffusion phenomenon through the Raffia vinifera fibre from the stem. The knowledge on the behavior of those fibres in presence of liquid during the realization of biocomposite, is necessary. The parameters like percentage of water gain at the point of saturation, modelling of the kinetic of water absorption, and the effective diffusion coefficient were the main objectives. Along a stem of raffia, twelve zones of sampling were defined. From Fick's 2nd law of diffusion, a new model was proposed and evaluated compared to four other models at a constant temperature of 23°C. From the proposed model, the effective diffusion coefficient was deduced. The percentage of water gain was in the range of 303–662%. The proposed model fitted better to the experimental data. The estimated diffusion coefficient was evaluated during the initial phase and at the final phase. In any cross section located along the stem of Raffia vinifera, it was found that the effective diffusion coefficient increases from the periphery to the centre during the initial and final phases.

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“…Equation (9) was used during the study of water absorption of hybrid [28] or dental composites [29]. …”

Section: Methodsmentioning

confidence: 99%

Study of Water Absorption in RaffiaviniferaFibres from Bandjoun, Cameroon

Tagne

Njeugna

Fogue

et al. 2014

The Scientific World Journal

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“…Both these processes result in a higher induced molecular mobility and, as a consequence, a decrease of the T g [25,4]. Therefore the water temperature of 60°C affected the orthophthalic matrix with a probable reduction of the T g .…”

Section: Weight Variationmentioning

confidence: 95%

“…The variation of shear-axial stress interaction in CFRP tendons for prestressed concrete as a result of exposure to aggressive solution environments (water, salt water and concrete pore solution) was experimentally investigated in [3]. In [4,5], the moisture absorption behaviour and associated mechanical degradation of unidirectional hybrid (carbon/glass) composite rods for overhead conductors was evaluated. The researches in [6,7] studied the moisture diffusion process in GFRP composites for a bridge deck and in pultruded profiles for structural applications, respectively.…”

Section: Introductionmentioning

confidence: 99%

Long-term bending performance and service life prediction of pultruded Glass Fibre Reinforced Polymer composites

Carra¹,

Carvelli

2015

Composite Structures

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“…The fatigue performance of composites is influenced by the composite system itself. Particularly influential parameters include; fibre and matrix properties, lay-up sequence [18,19], residual stresses due to the manufacturing process or due to discontinuities [20,21] and the maximum to minimum ratio of stress endured by the material [22,23,24,4], ply orientation [4], the fibre/matrix fractions [25], and environmental conditions affecting the composite components [26,27,28]. Exemplary works on the fatigue of composites covered from both experimental [29,22] and theoretical [4,30,31,32] perspectives may assist in the development of improved methods by which means composite failure can be predicted.…”

Section: Mechanics Of Cyclically Loaded Compositesmentioning

confidence: 99%

The fatigue of carbon fibre reinforced plastics - A review

Alam

Mamalis

Robert

et al. 2019

Composites Part B: Engineering

275

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Engineering structures are often subjected to the conditions of cyclic-loading, which onsets material fatigue, detrimentally affecting the service-life and damage tolerance of components and joints. Carbon fibre reinforced plastics (CFRP) are high-strength, lowweight composites that are gaining ubiquity in place of metals and glass fibre reinforced plastics (GFRP) not only due to their outstanding strength-to-weight properties, but also because carbon fibres are relatively inert to environmental degradation and as such, show potential as corrosion resistant materials. The effects of cyclic loading on the fatigue of CFRP are detailed in several papers. As such, collating research on CFRP fatigue into a single document is a worthwhile exercise, as it will benefit the engineering-readership interested in designing fatigue resistant structures and components using CFRP. This review article aims to provide the most relevant and up-to-date information on the fatigue of CFRP. The review focuses in particular on defining fatigue and the mechanics of cyclically-loaded composites, elucidating the fatigue response and fatigue properties of CFRP in different forms, discussing the importance of environmental factors on the fatigue performance and service-life, and summarising the different approaches taken to modelling fatigue in CFRP.

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Moisture absorption of unidirectional hybrid composites

Cited by 100 publications

References 29 publications

Study of Water Absorption in RaffiaviniferaFibres from Bandjoun, Cameroon

Study of Water Absorption in RaffiaviniferaFibres from Bandjoun, Cameroon

Long-term bending performance and service life prediction of pultruded Glass Fibre Reinforced Polymer composites

The fatigue of carbon fibre reinforced plastics - A review

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