Functionally graded adherends in adhesive joints: An overview

Reis, Mateus; Marques, E.A.S.; Carbas, R.J.C.; Silva, L.F.M. da

doi:10.1016/j.jajp.2020.100033

Cited by 24 publications

(10 citation statements)

References 173 publications

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“…5g, the wood surface does not have the same amount of wood partially removed from the superwood bulk, but the wood attached to the aluminum side of the joint is intact enough and thick enough an impression of the grain structure can be seen, most obvious in the darker band of material near the center if the joint. The deeper penetration into the surface allows for larger surface area for the adhesive to bond to as the adhesive spreads into the wood through any pores or vessels that were not completely collapsed during densification [29].…”

Section: Bonding Process Parameters To Joint Strengthmentioning

confidence: 99%

Dissimilar material joining of densified superwood to aluminum by adhesive bonding

Hartsfield,

Chen,

Liu

et al. 2024

Int J Adv Manuf Technol

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Superwood is a densified wood product that shows promise as a lightweight and renewable alternative for metallic materials. In order for this high-performance new material to be used in multi-material products, it must be able to be joined with other major materials. For example, joining superwood to aluminum would provide a key enabling technology for its use in automotive components since aluminum is presently a major lightweight material for such applications. In this paper, a methacrylate-based adhesive has been identified to provide high lap shear strength (7.5 MPa) for aluminum-to-superwood joints. The aluminum-to-superwood samples were prepared with different amounts of pre-polishing to create openings to the pores in the superwood so adhesive could penetrate into them and create a mechanical interlock, in addition to the hydrogen/chemical bonding at the surface between the methyl methacrylate (MMA) in methacrylate-based adhesive and the cellulose in superwood. For aluminum samples, a thin layer (typically a few nanometers) of oxide film on the surfaces provides hydrogen/chemical bond to MMA structure in the adhesive layer. The failure strength of the superwood-to-aluminum joint sample is about 50% higher than that of natural wood to natural wood joint sample and comparable to that of aluminum-to-aluminum joint sample.

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Section: Bonding Process Parameters To Joint Strengthmentioning

confidence: 99%

Dissimilar material joining of densified superwood to aluminum by adhesive bonding

Hartsfield,

Chen,

Liu

et al. 2024

Int J Adv Manuf Technol

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“…Multiple review papers have been published on the subject of adhesive bonding of composite substrates [ 8 , 36 , 37 , 38 , 39 ], describing a wide range of methods suitable for improving joint performance under different loading conditions. The current study further contributes to the literature by providing a detailed analysis of the recent developments on adherend modification of adhesive bonded composite joints.…”

Section: Introductionmentioning

confidence: 99%

Developments in Laminate Modification of Adhesively Bonded Composite Joints

et al. 2023

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The use of carbon fibre reinforced polymer (CFRP) materials is increasing in many different industries, such as those operating in the aviation, marine, and automotive sectors. In these applications, composite parts are often joined with other composite or metallic parts, where adhesive bonding plays a key role. Unlike conventional joining methods, adhesive bonding does not add weight or require the drilling of holes, both of which are major sources of stress concentration. The performance of a composite joint is dependent on multiple factors and can be improved by modifying the adhesive layer or the composite layup of the adherend. Moreover, joint geometry, surface preparation, and the manufacturing methods used for production are also important factors. The present work reviews recent developments on the design and manufacture of adhesively bonded joints with composite substrates, with particular interest in adherend modification techniques. The effects of stacking sequence, use of thin-plies, composite metal laminates and its specific surface preparations, and the use of toughened surface layers in the composite adherends are described for adhesively bonded CFRP structures.

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“…Today, this concept can also be implemented to reduce stress concentrations appearing along the adherend-adhesive interfaces of the adhesive joints serving under static, dynamic, and thermal loads, i.e., use of functionally graded adherends and adhesives [14]. The stress distribution and peak stress levels can be controlled by tailoring one-or two-dimensional composition variation of adherends as well as an adhesive with one or more other constituents [14][15][16]. This method is especially helpful for relieving thermal stresses due to thermal loads.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stress Formation in a Functionally Graded Al2O3-Adhesive Single Lap Joint Subjected to a Uniform Temperature Field

Apalak

Reddy

2023

MCA

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This study investigates the strain and stress states in an aluminum single lap joint bonded with a functionally graded Al2O3 micro particle reinforced adhesive layer subjected to a uniform temperature field. Navier equations of elasticity theory were designated by considering the spatial derivatives of Lamé constants and the coefficient of thermal expansion for local material composition. The set of partial differential equations and mechanical boundary conditions for a two-dimensional model was reduced to a set of linear equations by means of the central finite difference approximation at each grid point of a discretized joint. The through-thickness Al2O3-adhesive composition was tailored by the functional grading concept, and the mechanical and thermal properties of local adhesive composition were predicted by Mori–Tanaka’s homogenization approach. The adherend–adhesive interfaces exhibited sharp discontinuous thermal stresses, whereas the discontinuous nature of thermal strains along bi-material interfaces can be moderated by the gradient power index, which controls the through-thickness variation of particle amount in the local adhesive composition. The free edges of the adhesive layer were also critical due to the occurrence of high normal and shear strains and stresses. The gradient power index can influence the distribution and levels of strain and stress components only for a sufficiently high volume fraction of particles. The grading direction of particles in the adhesive layer was not influential because the temperature field is uniform; namely, it can only upturn the low and high strain and stress regions so that the neat adhesive–adherend interface and the particle-rich adhesive–adherend interface can be relocated.

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Functionally graded adherends in adhesive joints: An overview

Cited by 24 publications

References 173 publications

Dissimilar material joining of densified superwood to aluminum by adhesive bonding

Dissimilar material joining of densified superwood to aluminum by adhesive bonding

Developments in Laminate Modification of Adhesively Bonded Composite Joints

Thermal Stress Formation in a Functionally Graded Al2O3-Adhesive Single Lap Joint Subjected to a Uniform Temperature Field

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