Multi-material adhesively bonded structures: Characterisation and modelling of their rate-dependent performance

Lißner, Maria; Erice, Borja; Alabort, Enrique; Thomson, Daniel; Cui, Hao; Kaboglu, Cihan; Blackman, B.R.K.; Gude, Μaik; Petrinić, Nik

doi:10.1016/j.compositesb.2020.108077

Cited by 12 publications

(7 citation statements)

References 43 publications

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“…The adherent in contact with the loading pin was Ti-6Al-4V and the adherent in contact with the support was made out of IM7/8552 0.125 mm prepregs plies forming a laminate with a [45/-45/0/0/45/0/0/0/0/0/-45/0/45/0/-45/0]S layup configuration. More details for the motivation behind this particular configuration can be found in [4]. A Photron SA-5 camera was set to record 716×624 px 2 images of the displacement of the loading pin at 150 kfps and a Kirana camera focused on the crack area recorded 924×768 px 2 resolution images at 200 kfps.…”

Section: Validation With Enf Experimentsmentioning

confidence: 99%

“…The Titanium was assumed to be isotropic linear elastic and the CFRP laminate was discretised with 32 layers of orthotropic linear elastic material with the local orientations as indicated in the layup sequence. The material properties can be found in [4]. The adhesive layer was discretised using cohesive elements, while the rest employed 8-node reduced integration elements.…”

Section: Validation With Enf Experimentsmentioning

confidence: 99%

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On the Temperature Dependent Mechanical Response of Dynamically-loaded Shear-dominated Adhesive Structures

et al. 2021

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A mode II mechanical characterisation of the adhesive joints is performed testing shear lap joint specimens in a Split Hopkinson Tensile Bar (SHTB), equipped with a temperature chamber. The experimentallyobtained traction-separation curves were used to develop a Cohesive Zone Model (CZM) capable of representing the strain-rate and temperaturedependent mechanical response of the adhesive joints. To validate the model, End Notch Flexure (ENF) multi-material specimens made from titanium and carbon fibre reinforced polymer composite laminates were tested at different temperatures using a Split Hopkinson Pressure Bar setup with an in-house made temperature chamber. The finite element (FE) simulations of such tests employing the developed CZM showed the model’s ability to accurately predict the adhesive joints’ failure as well as to understand the failure sequence of multi-material adhesive joint combinations.

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Section: Validation With Enf Experimentsmentioning

confidence: 99%

Section: Validation With Enf Experimentsmentioning

confidence: 99%

On the Temperature Dependent Mechanical Response of Dynamically-loaded Shear-dominated Adhesive Structures

et al. 2021

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“…Therefore, the need for providing a higher interface between composite parts remains to grow and become an essential topic for researchers. [4][5][6] Generally, composite parts are joined using the mechanical fastening technique owing to their easy assembling and dismantling. However, the insertion of fasteners necessitates drilling holes on the composite laminate, which reduces the strength due to their higher notch sensitivity.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the need for providing a higher interface between composite parts remains to grow and become an essential topic for researchers. 4–6…”

Section: Introductionmentioning

confidence: 99%

Influence of glass fibre reinforced polymer composite pin reinforcement on shear and dynamic behaviour of composite joint manufactured through co-cure technique

Dhilipkumar

Rajesh

2022

Journal of Composite Materials

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The co-cure technique efficiently joins composite components in wings, ailerons, skins, ribs and spars in aeronautical applications. The present study investigates the effect of through-thickness reinforcement of glass fibre reinforced polymer composite pin on shear and dynamic properties of co-cured composite joints. The experimental results exhibited that through-thickness reinforcement with 2% composite pin volume significantly improved the shear strength and elongation limit by 38.4% and 102.4% compared to unpinned joints. Furthermore, composite pin reinforcement changed the catastrophic failure of co-cured joints to progressive failure due to the tougher bridging traction of composite pins. The comparison of fractured surfaces exposed that debonding, composite pin pull-out and shear fracture of pins are the major failure mechanisms involved in enhanced shear strength and progressive failure of co-cured composite joints. The experimental modal analysis avowed that through-thickness reinforcement with 2% composite pin volume improved the fundamental natural frequency of the co-cure joints, while co-cure joint reinforced with higher volume (4%) of composite pins had higher damping value due to excessive fibre damage, which increased interaction between composite adherent and adhesive.

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“…Ledford and co-workers [18,19] have successfully characterized double-lap joints (DLS) under high rates of loading using a split Hopkinson tension bar (SHTB). Other authors have used an SHTB to investigate small structures [13,[20][21][22][23][24][25][26][27][28]. Gonzales [13] studied the effect of loading rates on the strength of Al/S2-glass hybrid joints, in both a bonded and a bolted configuration, using a split Hopkinson tension bar.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Multi-Material Single-Lap Joints under High Rates of Loading Using a Split Hopkinson Tension Bar

Rüthnick

Imbert

May

2022

Metals

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In the presented research, a split Hopkinson tension bar (SHTB) was used to measure the mechanical response of multi-material single-lap joints in the high-rate loading regime. High-performance applications require high-quality measurements of the mechanical properties to define safe design rules. Servo-hydraulic machines are commonly used to investigate such small structures, but they are prone to produce oscillation-affected force measurements. To improve force–displacement measurements, an SHTB was chosen to investigate these joints. Three different kinds of joints were tested: multi-material bolted joints, multi-material bonded joints, and multi-material bonded/bolted joints. One substrate of the joints was made of aluminum (Al-2024-T3) and the other one was made of a laminated composite (TC250). A countersunk titanium bolt and a crash-optimized epoxy adhesive (Betamate 1496 V) were used to fasten the joints. A constant impedance mounting device was implemented to limit wave reflections and to improve the signal quality. Quasi-static experiments at a servo-hydraulic machine were performed to compare the data with the respective data from the high-rate loading conditions. The presented research shows that high-quality high-rate tests of multi-material single-lap joints can be achieved by employing an SHTB. With this high-quality measurement, a rate dependency of the mechanical behavior of these joints was identified. The dynamic increase (DI), which is the ratio of a high rate of loading over quasi-static loading, was measured for each of the joint types, where the dynamic increase in the max force was DI = 1.1 for the bolted, DI = 1.4 for the bonded, and DI = 1.6 for the bonded/bolted joints.

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Multi-material adhesively bonded structures: Characterisation and modelling of their rate-dependent performance

Cited by 12 publications

References 43 publications

On the Temperature Dependent Mechanical Response of Dynamically-loaded Shear-dominated Adhesive Structures

On the Temperature Dependent Mechanical Response of Dynamically-loaded Shear-dominated Adhesive Structures

Influence of glass fibre reinforced polymer composite pin reinforcement on shear and dynamic behaviour of composite joint manufactured through co-cure technique

Mechanical Behavior of Multi-Material Single-Lap Joints under High Rates of Loading Using a Split Hopkinson Tension Bar

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