Maximizing bearing fatigue lifetime and CAI capability of fibre metal laminates by nanoscale sculptured Al plies

Bosbach, Björn; Baytekin-Gerngross, Melike; Sprecher, Eike; Wegner, Johann; Gerngroß, Mark‐Daniel; Carstensen, Jürgen; Adelung, Rainer; Fiedler, Bodo

doi:10.1016/j.compositesa.2018.11.017

Cited by 15 publications

(5 citation statements)

References 42 publications

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“…Our results concur with conclusions made by other authors [33][34][35], indicating the need to increase the interlaminar properties of the laminate to limit the delamination size. This research supports that further by analysis of damage development in studied thresholds.…”

Section: The Solution Of Fmls' Cai Strength Improvement Based On Dama...supporting

confidence: 93%

“…Bosbach et al [35] tested CAI on 4/3 CARALL (5 mm thick); however, the reduction in compressive strength related to the intact state was not given, only the comparison to the carbon fibre-reinforced polymer (CFRP) counterpart (9% greater CAI strength of FML). Nevertheless, a detailed microscale damage analysis was carried out on the post-mortem sample, with numerous delaminations and inter-fibre failures identified.…”

Section: Introductionmentioning

confidence: 99%

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The Correlation of LVI Parameters and CAI Behaviour in Aluminium-Based FML

et al. 2023

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An experimental analysis of mechanical behaviour for aluminium-based fibre metal laminates under compression after impact was conducted. Damage initiation and propagation were evaluated for critical state and force thresholds. Parametrization of laminates was done to compare their damage tolerance. Relatively low-energy impact had a marginal effect on fibre metal laminates compressive strength. Aluminium–glass laminate was more damage-resistant than one reinforced with carbon fibres (6% vs. 17% of compressive strength loss); however, aluminium–carbon laminate presented greater energy dissipation ability (around 30%). Significant damage propagation before the critical load was found (up to 100 times the initial damaged area). Damage propagation for assumed load thresholds was minor in comparison to the initial damage size. Metal plastic strain and delaminations are dominant failure modes for compression after impact.

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Section: The Solution Of Fmls' Cai Strength Improvement Based On Dama...supporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

The Correlation of LVI Parameters and CAI Behaviour in Aluminium-Based FML

et al. 2023

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“…However, for FRPs such as carbon fibre reinforced plastics (CFRPs), riveting is not a material-appropriate design, due to their low bearing strength and high notch sensitivity [1,2]. Therefore, different attempts to reduce the notch sensitivity of composites are utilised; e.g., local thickening of the laminate [3], optimised laminate layup and stacking sequence [4,5], local inserts [6], z-pinning [4,7] and hybridisation with other materials [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

CFRP Thin-Ply Fibre Metal Laminates: Influences of Ply Thickness and Metal Layers on Open Hole Tension and Compression Properties

et al. 2020

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Thin-ply laminates exhibit a higher degree of freedom in design and altered failure behaviour, and therefore, an increased strength for unnotched laminates in comparison to thick-ply laminates. For notched laminates, the static strength is strongly decreased; this is caused by a lack of stress relaxation through damage, which leads to a higher stress concentration and premature, brittle failure. To overcome this behaviour and to use the advantage of thin-ply laminates in areas with high stress concentrations, we have investigated thin-ply hybrid laminates with different metal volume fractions. Open hole tensile (OHT) and open hole compression (OHC) tests were performed with quasi-isotropic carbon fibre reinforced plastic (CFRP) specimens. In the area of stress concentration, 90° layers were locally substituted by stainless steel layers of differing volume fractions, from 12.5% to 25%. The strain field on the specimen surface was evaluated in-situ using a digital image correlation (DIC) system. The embedding of stainless steel foils in thin-ply samples increases the OHT strength up to 60.44% compared to unmodified thin-ply laminates. The density specific OHT strength is increased by 33%. Thick-ply specimens achieve an OHC strength increase up to 45.7%, which corresponds to an increase in density specific strength of 32.4%.

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“…Recently, it has been shown that nanoscale sculpturing of pure metals and metal alloys can generate a metal surface offering a multitude of undercut surface structures per mm 2 allowing for an efficient mechanical interlocking with another material. [54][55][56][57][58] For the work presented here, this second material is Cu. The decisive point for such an Al-Cu joint is that the nanoscale sculptured Al surface structures must be enclosed by Cu to mechanically anchor the Cu layer, and thus, forming a high strength joint even under high mechanical loads without an intermetallic layer in between the Cu and Al joining partners.…”

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confidence: 99%

How to Obtain High Load-Bearing Al-Cu Joints by Nanoscale Sculpturing

Gerngross,

Baytekin-Gerngross,

Carstensen

et al. 2024

J. Electrochem. Soc.

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The electrochemical formation of high-mechanical-load-bearing Al-Cu joints and their characterization is presented. These Al-Cu joints rely on a mechanical interlocking between the Al and Cu layer ob-tained by nanoscale sculpturing of the Al joint partner, resulting in a hierarchical surface structure. The structure consists of cubes of var-ious sizes acting like hooks. When enclosed by Cu the cubic Al hooks establish a rigid connection between the Al and Cu joint part-ners. In addition, the hierarchical cubic Al structures allow for a gradual transition from Al to Cu in the Al-Cu joint. Therefore, such Al-Cu joints exhibit an extraordinary load carrying ability compared to other Al-Cu joints.

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Maximizing bearing fatigue lifetime and CAI capability of fibre metal laminates by nanoscale sculptured Al plies

Cited by 15 publications

References 42 publications

The Correlation of LVI Parameters and CAI Behaviour in Aluminium-Based FML

The Correlation of LVI Parameters and CAI Behaviour in Aluminium-Based FML

CFRP Thin-Ply Fibre Metal Laminates: Influences of Ply Thickness and Metal Layers on Open Hole Tension and Compression Properties

How to Obtain High Load-Bearing Al-Cu Joints by Nanoscale Sculpturing

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