Effect of water uptake on creep behaviour of glass–epoxy composites

Papanicolaou, George; Xepapadaki, A. G.; Zarouchas, Dimitrios

doi:10.1179/174328909x387874

Cited by 14 publications

(7 citation statements)

References 14 publications

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“…However, with a longer gas‐oil immersion time, a stiffening of the material containing a higher liquid concentration was observed. Papanicolaou et al18 also reported the anomalous creep behavior of glass epoxy composites in humid conditions. The creep strain of the material increased until the water uptake reaching a maximum value, but then rapidly decreased and after a long ageing time, the material became stiffer than the dry material.…”

Section: Resultsmentioning

confidence: 95%

Creep behavior of PLA‐based biodegradable plastic exposed to a hydrocarbon liquid

Widiastuti

Sbarski

Masood

2012

J of Applied Polymer Sci

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This study explores the effect of hydrocarbon liquid on creep behavior of polylactic acid (PLA)-based plastic. Evolution of the mechanical properties of the material was investigated experimentally by measurement of creep under tensile load. Tensile creep behavior was studied with a constant load over a temperature range from 30 to 50 C using specimens containing different levels of liquid. It was shown that the hydrocarbon liquid diffusion obeys the Fickian law of diffusion. The viscoelastic properties vary with temperature and these properties dramatically decrease above the glass transition temperature (T g ). Significant decreases in modulus and in the peak of tan d were observed with an increase in liquid concentration at low temperatures. In contrast, at high temperatures, drier material recorded lower storage modulus. However, only small changes of T g were recorded. Dependence of compliance on temperature was observed in the creep test at all levels of liquid content. With respect to drier samples, it was noted that the high liquid content material had a lower rate of increasing creep strain with temperature. Therefore, at elevated temperatures, higher creep strain of dry specimens was observed compared to those with a higher liquid content. The improvement of creep resistance and stiffening of material at high temperatures can be attributed to the significant increase of crystallinity fraction induced by liquid absorption. Understanding the effect of liquid diffusion in conjunction with temperature provides useful information for assessment of the potential use of this biodegradable plastic in load-bearing applications exposed to an organic liquid.

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Section: Resultsmentioning

confidence: 95%

Creep behavior of PLA‐based biodegradable plastic exposed to a hydrocarbon liquid

Widiastuti

Sbarski

Masood

2012

J of Applied Polymer Sci

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“…The advantage of such conductor core is its low coefficient of thermal expansion, which in turn reduces the sag during higher service temperatures. [18,19] The operating temperature of the conductors could be increased above 100°C, since the thermal insulation of polymer core composites can be increased beyond class "F."…”

Section: Introductionmentioning

confidence: 99%

Effect of Hybrid Fillers on GFRP Epoxy Composites with Water Immersion and Thermal Conditioning

Balasubramanya¹,

Bhattacharya

Bhaskaran³

2021

Macromolecular Symposia

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Glass fiber reinforced epoxy composite with graphene nanoplatelets, multi-walled carbon nanotubes, and aluminium trihydrate fillers are fabricated by the pultrusion method. The role of fillers in complementing each other, improving the dielectric properties of the epoxy matrix is not fully understood. The objective of this work is to investigate the effects of nano and micro fillers combination by short-duration laboratory ageing techniques. A comparison of aged and unaged specimen is carried-out by impedance spectroscopy and gravimetric analyses. The dielectric properties are observed to be dependent on the interaction between the fillers and the epoxy matrix, also on the relative permittivity of individual nanofillers, dissolved ions that diffuse with water into the bulk of the composites. The composite specimens are immersed in distilled water up to 360 h for water ageing and the temperature is varied from 25°C to 200°C for thermal ageing. The impedance spectroscopy of the composites is measured over the frequency range (10 Hz-8 MHz). The observed reduction in the impedance values indicate that dipolar polarization is occurring due to absorbed water molecules during water immersion and mobilization of free electrons is taking place due to an increase in temperature. This study indicates that the effect of ageing can be quantified in terms of changes in the impedance spectra. From the results obtained, the effect of fillers is implicit since diffusion coefficient values are reduced from 5.58 × 10 −9 m 2 s −1 of the base epoxy composite to 3.48 × 10 −9 m 2 s −1 in hybrid nanocomposites. The percentage of water absorption at equilibrium condition is reduced from 0.68% to 0.46% of the total mass.

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“…Moreover, sensitivity changes in accordance with stress level [3]. Papanicolaou et al compared the experimental and theoretical results for the creep behaviour of an epoxy material reinforced with fibreglass [4]. Bakonyi and Vas subjected nonreinforced polypropylene and fibreglass-reinforced polypropylene to creep and tensile tests at different loads for 10h is to determine the average ratios of failure force [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on the Effect of Creep Behavior on Epoxy Composites Reinforced with Yttrium Oxide Powder

Abed

Jadee

Battawi

2020

International Journal of Applied Mechanics and Engineering

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The creep test is one of the important approaches to determining some mechanical properties of composite materials. This study was carried out to investigate the creep behaviour of an epoxy composite material that was reinforced with Y2O3 powder at weight ratios of 2%, 7%, 12%, 17% and 22%. Each volume ratio was subjected to five loads over the range of 1N to5N at a constant temperature of 16 ± 2°C. In this work, creep behaviour, stress and elasticity modulus were studied through experimental and numerical analyses. Results showed that increasing the weight ratio of Y2O3 powder enhanced creep characteristics.

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Effect of water uptake on creep behaviour of glass–epoxy composites

Cited by 14 publications

References 14 publications

Creep behavior of PLA‐based biodegradable plastic exposed to a hydrocarbon liquid

Creep behavior of PLA‐based biodegradable plastic exposed to a hydrocarbon liquid

Effect of Hybrid Fillers on GFRP Epoxy Composites with Water Immersion and Thermal Conditioning

Experimental and Numerical Study on the Effect of Creep Behavior on Epoxy Composites Reinforced with Yttrium Oxide Powder

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