Adhesively bonded timber joints – Do defects matter?

Grunwald, Cordula; Fecht, Simon; Vallée, Till; Tannert, Thomas

doi:10.1016/j.ijadhadh.2014.07.003

Cited by 31 publications

(6 citation statements)

References 26 publications

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“…Grunwald [108] used numerical methods to investigate the effect of construction defects on the mechanical properties of GIR connections and discovered that connections with a 50% adhesive loss could still reach 70%.…”

Section: Influence Of Manufacturing Processmentioning

confidence: 99%

Research status of glued-in rods connections in wood structures

Zhang

Dauletbek

et al. 2023

Journal of Building Engineering

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Section: Influence Of Manufacturing Processmentioning

confidence: 99%

Research status of glued-in rods connections in wood structures

Zhang

Dauletbek

et al. 2023

Journal of Building Engineering

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“…Several publications deal with the influence of defects in bonded joints on their mechanical properties. Here, the focus was mainly on joints made of timber (Grunwald et al, 2014), steel (Karachalios et al, 2013), GFRP (Ascione, 2016), or CFRP (Ribeiro et al, 2016), as well as on improper adhesive mixing ratios (Adams and Cawley, 1988). These works are limited to single and double lap joints.…”

Section: Significance Of Air Entrapments In Adhesivesmentioning

confidence: 99%

“…A novel complex model for describing properties of thin films via energetic approaches to wetting can be found in Bertsch et al (2005), where slip is allowed at the fluid-substrate interface. In addition, an experimental study (Grunwald et al, 2014) investigated the influence of air defects on the load-bearing capacity of bonded wood joints, artificially imitating air pockets in the form of applied Teflon patches. However, fundamental work on gap flows with a focus on simplified assumptions as well as for the description of such joining processes does not exist in the literature.…”

Section: Hele-shaw Flowmentioning

confidence: 99%

Towards the efficient modelling of trapped air pockets during squeeze flow

Müller

Willenbrock

Stahl

et al. 2022

Exp. Comput. Multiph. Flow

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In most bonding processes, an adhesive is applied to a substrate in a specific pattern before the second substrate is subsequently pressed against it. During this, the adhesive flows in such a way that, ideally, it completely fills the joint. In practice, however, areas with entrapped air frequently remain in the bonded adhesive layer. Within the scope of a research project, these flows are systematically analyzed in order to identify optimal initial application patterns for the adhesive and substrate geometry to minimise such risks. For this purpose, the authors use an efficient flow model, the partially filled gaps model (PFGM), extended in this study to include the functionality of trapped air pockets. Depending on the volume fractions of air and adhesive, the flow of both phases is computed. Therefore, the model is introduced and fully described, benchmarked with respect to its plausibility and functionality, and results obtained are compared with a CFD calculation. Thereafter, the functionality of openings and closings of the pockets are analyzed. Lastly, the model is then applied to a real scenario created with a Hele-Shaw cell measurement. The benchmark as well as the comparison with the measurement results show the high potential of this technique.

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“…Nonetheless, several ways to minimise the effects of those imperfections have been proposed, such as wood densification, using wood particles or laminated wood, and using wooden composites. These advances have increased the usage of wood-based materials for structural applications in recent decades [ 61 , 62 ].…”

Section: Wood Substratesmentioning

confidence: 99%

Sustainable Development Approaches through Wooden Adhesive Joints Design

et al. 2022

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Over recent decades, the need to comply with environmental standards has become a concern in many industrial sectors. As a result, manufacturers have increased their use of eco-friendly, recycled, recyclable, and, overall, more sustainable materials and industrial techniques. One technique highly dependent on petroleum-based products, and at the edge of a paradigm change, is adhesive bonding. Adhesive bonding is often used to join composite materials and depends upon an adhesive to achieve the connection. However, the matrices of the composite materials and the adhesives used, as well as, in some cases, the composite fibres, are manufactured from petrochemical products. Efforts to use natural composites and adhesives are therefore ongoing. One composite that has proven to be promising is wood due to its high strength and stiffness (particularly when it is densified), formability, and durability. However, wood must be very carefully characterised since its properties can be variable, depending on the slope of the grains, irregularities (such as knots, shakes, or splits), and on the location and climate of each individual tree. Therefore, in addition to neat wood, wood composites may also be a promising option to increase sustainability, with more predictable properties. To bond wood or wooden composite substrates, bio-adhesives can be considered. These adhesives are now formulated with increasingly enhanced mechanical properties and are becoming promising alternatives at the structural application level. In this paper, wooden adhesive joints are surveyed considering bio-adhesives and wood-based substrates, taking into consideration the recent approaches to improve these base materials, accurately characterise them, and implement them in adhesive joints.

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Adhesively bonded timber joints – Do defects matter?

Cited by 31 publications

References 26 publications

Research status of glued-in rods connections in wood structures

Research status of glued-in rods connections in wood structures

Towards the efficient modelling of trapped air pockets during squeeze flow

Sustainable Development Approaches through Wooden Adhesive Joints Design

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