Mechanical performances of GFRP-steel specimens bonded with different epoxy adhesives, before and after the aging treatments

Giampaoli, M.; Terlizzi, Vanessa; Rossi, Marco; Chiappini, Gianluca; Munafò, Placido

doi:10.1016/j.compstruct.2017.03.020

Cited by 29 publications

(14 citation statements)

References 24 publications

(42 reference statements)

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“…Since UV degradation on the surface of polymers can facilitate water permeability [20,53,162], the effects of combining UV radiation with humidity have been investigated [6,20,154,162]. Giampaoli et al [165] evaluated the aging of steel/GFRP samples bonded with different adhesives, using two aging conditions. In one, continuous condensation (100% humidity) and temperature of 40 °C were applied.…”

Section: Uv Radiationmentioning

confidence: 99%

A review of the relationship between design factors and environmental agents regarding adhesive bonded joints

Gualberto

Amorim

Costa

2021

J Braz. Soc. Mech. Sci. Eng.

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Fiber-reinforced polymers (FRPs) combine characteristics of polymers and fibers to obtain a material with high mechanical strength and stiffness together with low specific mass and good corrosion resistance. The use of FRPs is growing as an alternative to metals in the automotive, aerospace and civil construction industries. Since adhesive bonded joints are an excellent way of joining materials due to the better load distribution, the use of FRPs for this purpose has been the objective of many studies about durability and structural safety. In service, environmental factors, including temperature, humidity, UV exposure and salt spray, can degrade materials, leading to unexpected failures. Since joints in service are subject to these multiple and uncontrolled adverse conditions, FRP adhesive bonded joint degradation has been studied by experiments that simulate these adverse environmental conditions. The combined analysis of the effect of environmental factors on the joint and the materials of each component allows predicting the system performance. In addition, optimal design parameters, such as the thickness of the adhesive, overlap length, materials and manufacturing processes, may be different according to the target application of the joint. Therefore, the achievement of optimal design parameters depends on the understanding of joint behavior in service. Based on analysis of the contribution of researchers in the specialized literature on adhesive joints and FRPs, this article reviews the main findings on degradation of adhesive joints and their components. Research topics for optimization of adhesive joint systems are also discussed.

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Section: Uv Radiationmentioning

confidence: 99%

A review of the relationship between design factors and environmental agents regarding adhesive bonded joints

Gualberto

Amorim

Costa

2021

J Braz. Soc. Mech. Sci. Eng.

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“…The increasing diffusion of adhesive joints is due to its advantages (i.e. more uniform distribution of stresses [7], greater contact area between joined materials [8], possibility of joining different materials [9], [10]). There are numerous studies in the literature aimed at investigating the stress distribution in the adhesive layer.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stresses in Adhesively Bonded Joints: Numerical and Analytical Analysis

Marchione

2021

Engineering Science & Technology

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The adhesive technique is observing a considerable increase in applications in various fields. Unlike traditional joining methods, this technology allows the stress peaks and the weight of the resulting structure to be reduced. Adhesive joints during their service life not only undergo mechanical but also thermal stresses. The thermal compatibility between the adhesive and the adherents used is a fundamental aspect to consider in the design phase. This paper reports on and analyses the results obtained from a linear Finite Element Method (FEM) simulation for a hybrid adhesive joint, as the thickness and characteristics of the adhesive layer vary. An analytical solution for adhesive free joints is presented according to both beam and plate theories. The analytical and numerical results, in case of no adhesive, are in good agreement with good approximation. The introduction of the adhesive layer allows to obtain higher displacement values than in the adhesive-free configuration. The increase in displacement and therefore in ductility confirms the effectiveness of the adhesive joint for real applications.

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“…However, GFRP composite materials may exhibit performance degradation when exposed to various environments [1,[14][15][16][17][18][19][20][21][22][23]. Especially in the case of a hybrid panel made by attaching steel and GFRP panels, there is the possibility of fracturing at the bond surface [1,[24][25][26][27]. Previous studies have evaluated the performance of hybrid panels when exposed to chemically harsh environments, such as those containing high levels of sulfate and sea water [1].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Fracture Properties of Steel/GFRP Hybrid Panels for an Improved Moveable Weir after Exposure to Accelerated Natural Environmental Conditions

et al. 2019

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This study evaluated the performance of a hybrid panel in an improved moveable weir after exposure to accelerated environmental climate conditions. When exposed to a river environment, corrosion problems on improved moveable weir steel panels can occur. To address this, a hybrid panel with structure layering glass fiber-reinforced polymer (GFRP) panels on both sides of the steel panel was used. The steel was, therefore, not exposed to the outside. However, this hybrid panel is a structure that uses a mixture of two materials with different properties and there is the possibility of performance degradation when the GFRP composite material, i.e., the structure that wraps around the bond interface, and the steel panel are exposed to a river environment. Thus, we evaluated the durability of the hybrid panels by repeated exposure to long-term high temperatures, dry–wet environmental cycling, long-term freezing, and freeze–thaw cycling in an accelerated climate deterioration environment. In the flexural tests, the surface processing of the steel panel was shown to be important, with sand-blasted test specimens showing higher flexural strength. For the control specimens, the flexural strength decreased as the thickness of the GFRP panels increased. However, for the sand-blasted specimens, the flexural strength increased as the thickness of the GFRP panels increased. After exposure to accelerated climate deterioration, the flexural strength tests showed that the residual strength increased with panel thickness and that the residual strengths were greater for specimens incorporating sand-blasted steel panels. The results of our testing show that hybrid panels incorporating sand-blasted steel were adequate for use in improved moveable weirs.

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Mechanical performances of GFRP-steel specimens bonded with different epoxy adhesives, before and after the aging treatments

Cited by 29 publications

References 24 publications

A review of the relationship between design factors and environmental agents regarding adhesive bonded joints

A review of the relationship between design factors and environmental agents regarding adhesive bonded joints

Thermal Stresses in Adhesively Bonded Joints: Numerical and Analytical Analysis

Mechanical and Fracture Properties of Steel/GFRP Hybrid Panels for an Improved Moveable Weir after Exposure to Accelerated Natural Environmental Conditions

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