Interlayer shear strength of polymer composite materials during long term climatic ageing

Старцев, О. В.; Krotov, A. S.; Startseva, L. T.

doi:10.1016/s0141-3910(98)00086-x

Cited by 37 publications

(7 citation statements)

References 2 publications

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“…[3] *Corresponding author. Email: farid.taheri@dal.ca Startsev et al [4] showed that the exposure of polymer composites to climatic aging would cause the through-the-thickness mechanical properties across the thickness to significantly degrade. Tsotsis et al [5] observed that FRP specimens' aging process was significantly accelerated when the material was subjected to large pressure magnitudes (especially in those with [±45°] 2s layup, which were subjected to a tensile load).…”

Section: Brief Review Of the Relevant Researchmentioning

confidence: 99%

Experimental investigation of the effect of aging on perforated composite tubes under axial compressive loading

Eslami¹,

Esmaeel²,

Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬³

2013

Advanced Composite Materials

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Section: Brief Review Of the Relevant Researchmentioning

confidence: 99%

Experimental investigation of the effect of aging on perforated composite tubes under axial compressive loading

Eslami¹,

Esmaeel²,

Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬³

2013

Advanced Composite Materials

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“…This is because it is demonstrated experimentally that the degradation of the mechanical strength of materials used in aviation varies in a layered way after exposure to a natural environment [13]. The degradation process can be considered as a progressing damaged front that moves from the outer…”

Section: Introductionmentioning

confidence: 99%

“…The degradation process can be considered as a progressing damaged front that moves from the outer surface through the laminate [14]. A gradient is generated through the laminate thickness and because of such a gradient effects on mechanical strength depend strongly on the laminate thickness [13,15]. The suggested method is based on the environmental resistance of the matrix.…”

Section: Introductionmentioning

confidence: 99%

Prediction of thermal strains in fibre reinforced plastic matrix by discretisation of the temperature exposure history

Ngoy

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Prediction of environmental effects on fibre reinforced plastics habitually is made difficult due to the complex variability of the natural service environment. This paper suggests a method to predict thermal strain distribution over the material lifetime by discretisation of the exposure history. Laboratory results show a high correlation between predicted and experimentally measured strain distribution IntroductionDue to the need for energy efficient materials, there has been a considerable increase of interest in light and green materials such as fibre reinforced plastics (FRP) in the aerospace industry. However, environmental effects have shown to be a hindrance to extensive use of FRP. A reliable method to quantify and predict environmental effects on FRP is required for safe and efficient use of these materials.Stresses resulting from environmental factors such as cycling temperature and humidity have been recognised as one of the most deleterious effect on FRP materials [1]. Hygrothermal stresses are known to be the cause for crack initiation and cause the material to become brittle or to deform [2,3]. They can approach or exceed the design load and acceptable material limits [4].A number of works on the modelling of environmental stress effect on FRP material have been reported [5][6][7][8][9][10][11][12]. These reports deal mostly with the characterisation of the effect of temperature and humidity on the stress state of composite laminates. In this regard, models and computation algorithms of various performance levels have been made available. However, most of the time complication results from the material heterogeneity and the complex variability of the environment. In addition, only the effect of the physical degradation is taken into account explicitly, while the material undergoes a chemical degradation also.This analysis focuses on the determination of environmental stresses without involving the resulting modification on the stress state of the material. Attention is on the prediction of a long-term effect, comprehensively taking into account the physical and the chemical degradation, as well as the viscoelastic, time-dependent effect. In the present paper, the thermal strain history is predicted based on the knowledge of temperature exposure. In a subsequent paper, strains will be used to compute stresses taking into account the time dependent relaxation and environmental degradation.For the purpose of this paper, only a one-dimensional problem in plate laminate is considered. This is because it is demonstrated experimentally that the degradation of the mechanical strength of materials used in aviation varies in a layered way after exposure to a natural environment [13]. The degradation process can be considered as a progressing damaged front that moves from the outer

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“…The bus shelter examined showed a 40% decrease in strength when compared to new panels. Startsev et al [6] reported on warm, humid climatic exposure on the Black Sea coast where it was found that solar radiation destroyed the surface layers of a laminate to a greater extent than the interior.…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of a literature survey, it would appear that environmental degradation, and particularly the damage resulting from exposure to outdoor conditions is primarily a matrix process [7]. Startsev et al [6] have graphically illustrated the change in interlayer shear strength with depth, of aged specimens. The explanation of the dependence of interlayer shear strength on depth has been ascribed to the outer layers being primarily affected by the climate with the properties of the inner layers being closest to the initial properties.…”

Section: Introductionmentioning

confidence: 99%

Environmental degradation using functionally graded material approach

Sevostianov

Sookay

Klemperer

et al. 2003

Composite Structures

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Interlayer shear strength of polymer composite materials during long term climatic ageing

Cited by 37 publications

References 2 publications

Experimental investigation of the effect of aging on perforated composite tubes under axial compressive loading

Experimental investigation of the effect of aging on perforated composite tubes under axial compressive loading

Prediction of thermal strains in fibre reinforced plastic matrix by discretisation of the temperature exposure history

Environmental degradation using functionally graded material approach

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