Toughening strategies in adhesive joints

Maloney, Kevin J.; Fleck, N.A.

doi:10.1016/j.ijsolstr.2018.08.028

Cited by 44 publications

(30 citation statements)

References 25 publications

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“…The curves fluctuate with polylines because during the peeling test, the cohesion force among the fibers fails to be bonded jointly by thermal bonding and then becomes the stress concentration point [42]. Subsequently, the tensile force propagates to the thermal bonding points or interlocking interface, and the composites exhibit higher peeling strength [27,43].…”

Section: Resultsmentioning

confidence: 99%

Investigation on the rebound rate for polymeric composites and nonwoven needle punched fabrics at various depths

Jhang

Lin

Chen

et al. 2020

Journal of Industrial Textiles

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The study employs the mechanical interlocking theory and hot pressing treatment to generate nonimpregnation of highly rebounding composites. This design preserves the high flexibility, elasticity, and stability of elastic polymer while reserving the skin-friendly feature, resilience, and recovery of the highly elastic nonwoven fabrics without using an adhesive. During the preparation of highly rebounding composites, elastic polymers are hot pressed to form films, after which they are combined with highly elastic nonwoven fabrics. The composites are then examined in terms of the mechanical properties and the level of adhesion. Fluffy nonwoven fabrics and elastomer polymers are hot pressed in order to obtain better adhesion and puncture resistance. The tensile and hammer rebound rate test results show that highly rebounding composites that are reinforced using stiff nonwoven fabrics exhibit greater resilient and tensile properties. Comparing to pure nonwoven fabrics, the proposed highly rebounding composites have a structure that is 1.5 time greater compactness, as well as 1.5 times greater a tensile strength and 1.6 time greater resilience. Namely, they provide great variety according to the users’ ends as their performances are better and adjustable. For example, shallowly or deeply needle punched nonwoven fabrics can be separately used in the garments or cushions. The proposed highly rebounding cushion composites are protective materials and are suitable for the application as in cushions, packaging, and buffering protective equipment.

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Section: Resultsmentioning

confidence: 99%

Investigation on the rebound rate for polymeric composites and nonwoven needle punched fabrics at various depths

Jhang

Lin

Chen

et al. 2020

Journal of Industrial Textiles

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“…Solutions must be found to assess the influence of different geometric parameters and technological aspects [30,31,32,33,34,35,36]. In general, it is necessary to develop damage tolerant designs of (1) simple joints (SLJs) or (2) more complex structural joints that will have a higher toughness against crack propagation and will be less prone to scatter in strength [37]. Other vital issues include optimization, fracture characterization, and comparisons of FEM models with laboratory results [38,39,40,41].…”

Section: Introductionmentioning

confidence: 99%

“…The fundamental challenge for industrial applications is to ensure high reliability and durability of adhesive or hybrid joints over the entire service lifetime of the connected structural elements. The satisfaction of these requirements will lead to optimization and further improvement regarding the following: Enhanced strength and toughness of adhesive joints by the addition of nanoparticles, fibers, or woven mats, e.g., [42,43], or the introduction of a “stop hole” to blunt the tip of a crack [37]; the application of more effective mechanical fastening, e.g., “z-pins” [37]; the modification of the lap joint area geometry; the use of modern joining techniques, such as friction stir welding, e.g., [44], laser beam welding, or electron beam welding.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Single Lap Geometry in Adhesive and Hybrid Joints on Their Load Carrying Capacity

Golewski

Sadowski

2019

Materials

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The manufacturing technology for adhesive joints is not yet fully optimized, as proved by a large number of papers that have been published in recent years. Future studies on innovative techniques for fabricating adhesive joints should investigate the influence of parameters such as: (1) The shape of adhesive protrusion, (2) lap dimensions, and (3) cohesive layer reduction in the most efforted regions of the joint. With the application of additional mechanical connectors (e.g., rivets, screws, and welds) in adhesive joints, new hybrid connections can be fabricated. The number of publications in this new field is still relatively small. To fill the gap, this paper presents the results of a numerical analysis of different single lap geometries in (1) pure adhesive and (2) hybrid joints. A total of 13 different models with the same surface area of the adhesive layer were considered. In the case of hybrid joints, the adhesive surface before the application of mechanical connectors was assumed to be the same in every tested case. The numerical analysis of pure adhesive and hybrid joints revealed that the differences in strength led to a 30% decrease in the load capacity of these joints. Therefore, when designing pure adhesive and hybrid joints, special attention should be paid to the shape of the lap between the joined elements.

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“…The first one involves a modification of the interface itself, for instance through the generation of microstructural gradients within the layers surrounding the interface under concern (e.g. entanglement of polymer networks (Brown, 1991)), mechanical interlocking (Kim et al, 2010;Larsson et al, 2005), crack arrest patterns (Maloney and Fleck, 2019) or complex interface morphology (Cordisco et al, 2016). While efficient, these techniques are restrictive as they imply a complex deformation and fracture process or can be used only for specific materials.…”

Section: Introductionmentioning

confidence: 99%

Interface toughening in multilayered systems through compliant dissipative interlayers

Dépinoy

Strepenne

Massart

et al. 2019

Journal of the Mechanics and Physics of Solids

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The effect on an interlayer on the toughness of an interface between a ductile thin film and an elastic substrate is investigated by finite element modeling and assessed towards experimental measurements. The model is based on an asymptotic K-field formulation relying on cohesive zone elements to simulate the fracture process. A compliant interlayer tends to increase the interface toughness by promoting plastic dissipation in the thin layer. Additional toughening can result from the development of plastic strains in the interlayer. The magnitude of these two toughening mechanisms depends on the film thickness, among other parameters. The model predictions are confirmed by comparison with wedge-opening test data performed on a multilayer composed of a thin Cu layer and a polymer interlayer embedded between two stainless steel substrates. These findings lay the foundation for the design of tougher multilayers and provide a critical assessment of 2 experimental protocols for interface toughness measurements requiring the bonding of a dummy substrate, such as used for DCB or four point bending tests.

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Toughening strategies in adhesive joints

Cited by 44 publications

References 25 publications

Investigation on the rebound rate for polymeric composites and nonwoven needle punched fabrics at various depths

Investigation on the rebound rate for polymeric composites and nonwoven needle punched fabrics at various depths

The Influence of Single Lap Geometry in Adhesive and Hybrid Joints on Their Load Carrying Capacity

Interface toughening in multilayered systems through compliant dissipative interlayers

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