SIF for Double- and Single-sided Composite Repair in Mode I and Mixed Mode

Bouiadjra, B. Bachir; Fekirini, Hamida; Belhouari, M.; Sérier, B.; Benguediab, M.; Ouinas, Djamel

doi:10.1177/0731684409102836

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…Putting Equation (12) into Equation (2) gives the differential equation of interfacial temperature strain distribution:…”

Section: Analytical Modelmentioning

confidence: 99%

“…Although extensive experimental, analytical and numerical studies on the delamination of composite sandwich materials have been conducted in recent years [5][6][7][8][9][10][11][12][13][14][15], most of them ignored the effects of environmental temperature on the interfacial delamination behaviour. It is well known that composite skins and core materials are sensitive to temperature, the mechanical performance and interfacial behaviour change with the environmental temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Analytical method for determination of temperature-induced interfacial shear stress in foam-core composite sandwich materials

Yang

Sun

et al. 2018

Plastics, Rubber and Composites

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Composite sandwich materials with glass fibre-reinforced plastic (GFRP) skins and a foam core have been widely used in civil engineering. However, the interfacial delamination is the main failure mode in practice, especially at elevated temperatures. Temperature-induced interfacial shear stress can be generated because of the different coefficients of thermal expansion of GFRP skin and foam core, which can weaken the interfacial bond strength of sandwich materials. In this study, to investigate the distribution of temperature-induced interfacial strain, an analytical model was developed by using the infinitesimal method. In the meantime, a series of foam-core composite sandwich materials were tested via a kind of non-direct test method at different temperatures to validate the accuracy of the proposed analytical model. Finally, the comparison between experimental and analytical results demonstrates that the proposed analytical model can predict the interfacial strain distribution of sandwich structures at elevated temperatures.

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“…Putting Equation (12) into Equation (2) gives the differential equation of interfacial temperature strain distribution:…”

Section: Analytical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical method for determination of temperature-induced interfacial shear stress in foam-core composite sandwich materials

Yang

Sun

et al. 2018

Plastics, Rubber and Composites

View full text Add to dashboard Cite

show abstract

“…A large number of experimental and analytical researches on the delamination of composite sandwich materials have already been carried out in the past decades. 2–6 Vadakke and Carlsson 7 investigated the interfacial bonding properties between the surface layer and the foam core material. The test results showed that the interfacial bonding strength was significantly affected by the density of foam core.…”

Section: Introductionmentioning

confidence: 99%

Mode I interfacial fracture characterization of foam core sandwich materials at elevated temperatures

Wang

Liu

et al. 2017

Journal of Reinforced Plastics and Composites

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Foam core sandwich materials are being widely used in structural engineering due to their advantages such as lightweight, high strength, and corrosion resistance. But the interfacial bond strength of foam core sandwich materials is weakened at elevated temperatures. In practice, the influence of high temperature cannot be ignored since the composites with foam are sensitive to the change in the environment. In this study, a series of sandwich double cantilever beams were tested at different temperatures to evaluate the effect of high temperatures on the interfacial fracture of the foam core sandwich materials. The temperature range studied was from 30 to 90℃, noting the glass transition temperatures are 85.7℃ for the composites and 72.1℃ for the foam core, respectively. In the meantime, the mode I interfacial crack propagation and its corresponding interfacial strain energy release rate were analyzed. Furthermore, an analytical model, considering the change in temperature, was proposed to predict the strain energy release rate of mode I interfacial facture of the foam core sandwich materials. The analytical results were found to be well matched with the experimental results.

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“…The authors 21,22 have highlighted the advantage of the double-sided patch repair compared to single-sided patch repair on the reduction of the SIF. They indicated that the adhesive properties must be optimized in order to increase the advantage of the double-sided patch and to avoid adhesive failure.…”

Section: Introductionmentioning

confidence: 99%

The optimization thickness of single/double composite patch on the stress intensity factor reduction

Ouinas

Achour

Bouiadjra³

et al. 2013

Journal of Reinforced Plastics and Composites

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The repairing process of structures using bonding of composite materials is an efficient and economic way of increasing service life of damaged structures. The finite element method is developed and applied to assist in the design, assessment and optimization of the proposed plans before they are implemented, therefore reducing cost and time. In this study, the finite element method is used to analyze the behavior of a repaired crack using single and double circular composite patches by determining the stress intensity factor reduction. The effects of geometrical and mechanical properties of the patch on the fracture parameters are highlighted. The results show that the thickness gain and the reduction of the asymptotic value of the SIF in the case of the double patch is 7% when compared to the single one. Thus, the gain in the thickness decreases when the thickness of the bonded patch increases up to a value eP = 0.8 mm and beyond this value, it starts increasing. However, an inverse behavior occurs for the mixed mode. In addition, whatever is the size of the strengthened crack, the gain in thickness exceeds 16% in mode I and 20% in mixed mode.

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SIF for Double- and Single-sided Composite Repair in Mode I and Mixed Mode

Cited by 8 publications

References 9 publications

Analytical method for determination of temperature-induced interfacial shear stress in foam-core composite sandwich materials

Analytical method for determination of temperature-induced interfacial shear stress in foam-core composite sandwich materials

Mode I interfacial fracture characterization of foam core sandwich materials at elevated temperatures

The optimization thickness of single/double composite patch on the stress intensity factor reduction

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