Degradation of single lap adhesively bonded composite joints due to hot water ageing

Soykök, İbrahim Fadıl

doi:10.1080/00218464.2015.1076340

Cited by 22 publications

(13 citation statements)

References 29 publications

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“…This shows that enviromental temperature plays a decisive role in the diffusibility of water molecules in fiber-reinforced composites. At higher temperatures, more filtration of the water into the matrix of the resin takes place [27]. This is explained by the fact that the moisture absorption rates of the specimens kept in hot water at 70 0 C are higher than those kept in hot water at 50 0 C.…”

Section: Moisture Absorption Rates Of Specimensmentioning

confidence: 99%

“…In literature, the adhesive patch bonds and the effects of environmental conditions on these bonds and composites have been experimentally examined in many studies. Especially the studies on using single-patch repair [1][2][3][4][5][6][7][8][9][10]12,14,15,17], the patch applied on specimen having hole damage at the center [1,2,15,16,19], repairing the damaged composite specime ns, and the effects of moisture/temperature on the composite specimens [21,24,[26][27][28]30] have a significant place in literature. Among the studies carried out on patch, Campilho et al [1,2] repaired the composite plate, which were holed at the center, by making use of patch on the single surface.…”

Section: Introductionmentioning

confidence: 99%

“…Akderya et al [26] experimentally investigated the effects of thermal ageing on the tensile properties of composites, joints of which were established by using adhesives. Soykok [27] examined the behaviors of single lap adhesively bonded glass fiber-reinforced epoxy composite specimens in the hot water. The prepared composites were kept in hot water for one or two weeks at 50°C, 70°C, and 90 °C, and then tensile test was applied.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Hot Water Ageing on the Glass Fiber Reinforced Epoxy Composite

Örçen¹

2019

European Journal of Technic

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In the present study, the effects of hot water ageing on the glass fiber reinforced epoxy woven composites were experimentally examined. The specimens in three groups which undamaged, damaged, and single patchrepaired ones were kept in tap water at 50°C and 70°C temperature for 8 days and 16 days. At the end of those periods, the moisture absorption rates were calculated, the maximum failure loads at the end of period of keeping in hot water were determined and the failure modes occurring on these specimens were observed and compared. As a result of experimental study, it was found that the moisture absorption rates increased but the failure load values decreased together with the increase in water temperature and duration of hot water ageing.

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Section: Moisture Absorption Rates Of Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Hot Water Ageing on the Glass Fiber Reinforced Epoxy Composite

Örçen¹

2019

European Journal of Technic

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“…The problems of single lap joint with humidity exposure were studied by Goglio et al [17], the main defect mechanism was the presence of bubbles filled with water at primary substrate/adhesive layer modifying the surface bonding area and thus taunting the failure. Hydrothermal influence in adhesive bonded joints was observed by Soykok [18], considering the heat and moisture ageing process the maximum strength and stiffness of joints reduce by a significant value after a period of exposure at hot water.…”

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confidence: 99%

Investigation of UV exposure in adhesively bonded single lap joints

et al. 2018

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BackgroundIn recent decades adhesively bonded joints gained attention in many industries such as automotive, aeronautics and offshore, increasing structural mechanical repair services and thus promoting technological advances. It is a trend to nowadays replace welded and bolted joint for adhesively bonded joint. Advantages over welded and bolted joints are don't need a fire exposure, fast manufacturing, fatigue and corrosion resistance. Although the geometry of bonded joint is complex considering particularities at the end of joint, adhesive joint promotes a decrease of stress concentration [1,2].A relation between adherend and adhesive material and consequently the load transfer of joint is intrinsically related to surface state. The correct preparation requires total removal of contaminants (remaining corrosion layers, dirt, lubricating and bio-organisms) is needed [3]. A strong adhesion depends on bonding surface treatment in order to improve a joint strength, although bond strength doesn't increase with increase of roughening [4]. The surface roughness modifications in the bonded area of the joint promote an expressive effect in the bonded structures [5,6].The main techniques for surface modification are sandblasting, grinding and chemical cleaning that makes a generation of specific surface topographies at bonding area. The advantages of bonding area preparation are a great mechanical coupling of the adhesive AbstractAdhesively bonded joints are being widely used in the fabrication process of aircraft and automobile structures. Surface roughness is an important parameter of product quality that strongly affects the performance of mechanical parts, as wel as production costs. This parameter highly influences the mechanical properties overall of such structures. The effects of UV radiation on the single lap joints manufactured with different types of surface preparation and temperature were examined before and after UV exposure. Sandblasting, sanding and chemical cleaning were used as surface preparation and two test temperatures were used for investigation, 25 and 115 °C. The results of those tests showed that surface preparation highly influences shear strength, but does not affect the stiffness of the tested joints. Temperature also influences the shear strength and stiffness. UV radiation contributes to increase shear strength and do not degrade the tested single lap joints.

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“…[9] The factors causing degradation of polymeric materials can include temperature, humidity, and also the action of microorganisms. Adhesive bonds based on the composite, where the matrix is epoxy resin, are often exposed to various degradation effects [10][11][12][13]. The filler, which is present in order to optimize some mechanical properties (the shear strength in the case of adhesive bonds), can negatively affect the process of degradation, for example, by its absorptivity.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization of degradation of reactive resin filled with organic microparticles

Habrová¹,

Valášek²

2017

Engineering for Rural Development

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Abstract. Composite materials rank among the structural materials with a highly promising trend. The main advantage of composite materials is the synergistic effect of the individual sub-components of the system, which allows great adaptation of these materials and excellent mechanical properties. In recent years, the substitution of inorganic materials with organic materials is increasingly used in the field of composite systems. From the materials engineering point of view, this substitution makes use of very interesting properties of natural fillers. These materials are environmentally friendly and their prices are usually lower than similar synthetic fillers. However, it is also necessary to mention the negative side of organic fillers and that is their natural character. Natural fillers are so different from one another and evince greater variance than the observed values of synthetic materials. In terms of long-term applications, the degradation of natural materials can rank among limits. Natural particulate fillers can be utilized in interaction with reactive resins; they can reduce the final price while maintaining the adhesive characteristics. This paper describes the adhesive characteristics of reaction resins filled with microparticles prepared from pomace seeds of Phoenix dactylifera and it also describes the degradation of these materials. A climatic chamber was used for this experiment. Describing the degradation processes it is important to define application areas. Electron microscopy was used when evaluating the failure of bonded joints. The degradation corresponding to 35 cycles resulted in a 37 % decrease in shear strength.Keywords: composite system, mechanical properties, Phoenix dactylifera, SEM. IntroductionComposite materials are materials that combine mechanical and physical properties of their subphases, currently, the composite systems are widely used in industries due to their flexible properties [1; 2]. Particulate fillers in polymer materials are used primarily to increase the hardness, abrasion resistance or optimize the tensile characteristics [3; 4]. The presence of particles leads to optimize the shear strength while reducing the prices of the resulting joint in the area of bonded joints. Currently, the synthetic materials are increasingly replaced with natural ones. The natural fibers and particles are used in the composite systems. The particles based on wood (e.g., wood flour, flour made from bamboo) or biomass resulting from processing of certain species of plants and their fruit (Jatropha curcas) can be used as a filler for composite systems [5; 6]. Natural particles minimize the cost and optimize certain mechanical characteristics [6][7][8]. The interfacial interaction is an important factor from the resulting mechanical characteristics point of view. The chemical surface treatment is often used to optimize the reinforcement on the natural basis. The adhesive and cohesive characteristics of the composite system affect the concentration of particles and their morphology -whi...

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Degradation of single lap adhesively bonded composite joints due to hot water ageing

Cited by 22 publications

References 29 publications

The Effect of Hot Water Ageing on the Glass Fiber Reinforced Epoxy Composite

The Effect of Hot Water Ageing on the Glass Fiber Reinforced Epoxy Composite

Investigation of UV exposure in adhesively bonded single lap joints

Experimental characterization of degradation of reactive resin filled with organic microparticles

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