The effect of thermo-oxidative aging on carbon fiber reinforced cyanate ester composites

Fiamegkou, E.; Kollia, Evgenia; Vavouliotis, A.; Kostopoulos, V.

doi:10.1177/0021998314561280

Cited by 18 publications

(19 citation statements)

References 16 publications

(17 reference statements)

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“…The used data comes from the case of an aircraft air-conditioning plenum. All the data used in the present analysis has been already published elsewhere [18,19]. All the proposed procedures are part of a developed application written in Python programming language that works for the general estimation of service life of composite components.…”

Section: Models For Combined Diffusion and Moduli Degradation Analysimentioning

confidence: 99%

“…For the purpose of this study, experimental data based comes from the work of Fiamegkou et al [18] and Kollia et al [19] have been used. In these works the authors investigated the effect of hydrothermal ageing on the mechanical and thermo-mechanical properties of glass fiber reinforced cyanate-ester composites, material that is used for the construction of plenum, one of the most basic parts of the environmental control system of aircrafts.…”

Section: Materials and Structurementioning

confidence: 99%

“…The composite materials system that was investigated by Fiamegkou et al [18] and Kollia et al [19] and used in the current study is the commercial prepreg system of PN901-G201-45 obtained by Gurit (Switzerland). It has a reinforcement phase of woven fabric of E-glass filament yarn 390 g/m 2 , 2/2 twill preimpregnated with phenylene (C6H4) cyanate ester resin PN901.…”

Section: Materials and Structurementioning

confidence: 99%

“…These materials are parts of the family of thermosets and have characteristics that are very efficient for many applications in different sectors. As matrix materials they perform good physical, electrical, thermal and processing properties [19][20].The composite materials system that was investigated by Fiamegkou et al [18] and Kollia et al [19] and used in the current study is the commercial prepreg system of PN901-G201-45 obtained by Gurit (Switzerland). It has a reinforcement phase of woven fabric of E-glass filament yarn 390 g/m 2 , 2/2 twill preimpregnated with phenylene (C6H4) cyanate ester resin PN901.…”

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Models for Combined Diffusion and Moduli Degradation Analysis of Glass Reinforced Cyanate Ester Composites Structures

Kelverkloglou¹,

Tsantzalis²,

Kostopoulos³

2017

MOJPS

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The need to develop methodologies for life prediction of glass fibre reinforced polymers (GFRPs) has rapidly increased with the use of composites in many different industries. Currently, there is very little understanding of the ageing mechanisms in composites. It is important to develop a detailed through the thickness degradation analysis due to ageing, so as to predict its effect on the lifetime of composite structures. In the first part of this study an effort has been made to model the moisture absorption, the concentration of the absorbed fluid, and the reduction of mechanical properties, especially elastic moduli and strength in the through the thickness direction of a GFRP structure. The water absorption behavior of woven glass fibre reinforced cyanate ester composites used in the plenum of the air conditioning pack of aircraft's environmental control system has been modeled. The combined models describe the diffusion procedure primarily at material level and continuously at structure level. The amount of the absorbed moisture can be crucial for the mechanical behavior of the structure. Therefore, there is a need for a better understanding of the evolution of mechanical properties during ageing. The whole procedure utilizes the results of the diffusion model for the calculation of the degradation of the moduli during the water uptake process. Predictive models have been proposed, by considering different sections throughout the thickness and provide a solid background for modeling the long term behavior of a structure under consideration exposed at different temperature and different time period. Keywords: Models for Combined Diffusion and Moduli Degradation Analysis of Glass Reinforced Cyanate Ester Composites Structures 2/15Copyright: ©2017 Kostopoulos et al. there is a need for a deeper understanding of the degradation of composite properties during given operating ageing so as to predict the mechanical properties at any given time [9].Primarily, SD Speake et al. [10] had tried to create a method in order to predict the changes of mechanical properties in laminates as a consequence of prolonged immersion in water. These changes were found to be function of the absorbed moisture [10]. In S. Kajorncheappunnganet al.[11] studied the effects of the environmental ageing on the durability of glass/ epoxy composites. He was focused on the major factors that influenced the degradation of glass/epoxy composites [11]. In JR Reeder et al. [12] had developed a prediction methodology of long-term strength degradation of thermoplastic composites using time-temperature superposition [12]. In P. Surathi et al. [13] tried to investigate the reduction of moduli and strengths according to moisture absorption measurements [13]. In G. Carra et al. [14] tried to estimate the reduction of mechanical properties of pultruded glass fibre reinforced polymer composites due to their exposure in combined environmental agents [14]. In Duncan Bruce et al. [15] were focused on measurement and modelling of permeation and d...

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Section: Models For Combined Diffusion and Moduli Degradation Analysimentioning

confidence: 99%

Section: Materials and Structurementioning

confidence: 99%

Section: Materials and Structurementioning

confidence: 99%

mentioning

confidence: 99%

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Models for Combined Diffusion and Moduli Degradation Analysis of Glass Reinforced Cyanate Ester Composites Structures

Kelverkloglou¹,

Tsantzalis²,

Kostopoulos³

2017

MOJPS

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“…For example in aeronautics and aerospace industries some application needs lightweight materials with high temperature service ceiling (due to their high Tg) and low shrinkage render CEs, and cyanate ester resin fulfill these specifications [3][4]. The key advantages of this type of resins are their stiffness, their dimensional stability under extreme environmental conditions like exposure in high temperatures and moisture, their good adhesive and electrical properties [5][6]. Moreover, the development of novel polymer formulations has allowed composites to find application in aggressive operational environments.…”

Section: Introductionmentioning

confidence: 99%

Description of Anomalous Water Absorption Behaviour of Woven Glass Reinforced Cyanate Ester Composites

Kelverkloglou¹,

Kollia²,

Vavouliotis³

et al. 2016

Plastic and Polymer Technology

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This work studies the water absorption behaviour of woven glass fibre reinforced cyanate ester composites used in the plenum of the air conditioning pack of aircraft's environmental control system. For absorption tests, samples were immersed in distilled water baths at four different temperatures: 40°C, 60°C, 75°C and 90°C. In general, the composites have shown strong nonFickian behaviour. The progression of mass absorption is described analytically using a combination of Fickian diffusion and relaxation process. Thus for the temperatures of 40°C, 60°C and 75°C a dual stage model was used. At 90°C the material exhibits extreme non-Fickian behaviour due to chemical ageing procedures which cannot be accurately modeled. From the mass control analysis, lots of information is provided for the correlation between the temperature and the diffusion coefficient or the start of the moisture equilibrium. Also, the regions of physical and chemical ageing can be clearly distinguished, giving a good profile of the material behaviour at elevated temperature. The dual stage model that is proposed precisely describes the behaviour of these materials at different temperatures up to 75°C. The chemical ageing that is taking place at 90°C creates another profile that should be investigated in a more detailed level than macro-scale.

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Chemo‐ and Regioselective Synthesis of Arylated γ‐Valerolactones from Bio‐based Levulinic Acid with Aromatics Using H‐β Zeolite Catalyst

Gundekari

Srinivasan

2019

ChemCatChem

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Catalytic coupling of biomass-based molecules to value-added chemical intermediates is an interesting area in biomass research. Arylated γ-valerolactones (Agvls), promising pharmaceutical intermediates that have significant biological activity, are primarily synthesized currently through petro-route. In this paper, we report successful biomass-based synthesis of Agvls using levulinic acid (LA) and oxygen or sulphur-substituted aromatics over H-β zeolite as catalyst under solvent-free conditions. Under optimized condition, LA and anisole render 90 % conversion of former with 82 % yield of para-substituted γlactone. CÀ C bond formation followed by intra-molecular esterification is witnessed in the course of the reaction, which is highly chemo-and regioselective. Though catalyst deactivated while reuse due to deposition of organic carbon moieties as deduced from several physicochemical techniques, it could be regenerated by simple calcination.[a] Dr.

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The effect of thermo-oxidative aging on carbon fiber reinforced cyanate ester composites

Cited by 18 publications

References 16 publications

Models for Combined Diffusion and Moduli Degradation Analysis of Glass Reinforced Cyanate Ester Composites Structures

Models for Combined Diffusion and Moduli Degradation Analysis of Glass Reinforced Cyanate Ester Composites Structures

Description of Anomalous Water Absorption Behaviour of Woven Glass Reinforced Cyanate Ester Composites

Chemo‐ and Regioselective Synthesis of Arylated γ‐Valerolactones from Bio‐based Levulinic Acid with Aromatics Using H‐β Zeolite Catalyst

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