Experimental and numerical failure analysis of aluminium/composite single-L joints

Domingues, N.; Campilho, R.D.S.G.; Carbas, R.J.C.; Silva, Lucas F. M. da

doi:10.1016/j.ijadhadh.2015.10.011

Cited by 40 publications

(14 citation statements)

References 29 publications

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“…[244] Despite the fact that adhesively-bonded joints represent a great potential in the aerospace industry, there are various limitations and challenges facing the further expansion and utilization of them. The quality and strength of adhesively-bonded joints, especially for composite materials, relies on many parameters, some of which are design-driven, [16,[245][246][247][248][249][250] such as the geometrical parameters, materials to be joined and the adhesive characteristics, while others are manufacturing and process-driven, [244,[251][252][253] such as the surface pre-treatments, the bonding area and the effect of defects. In fact, the preparation of any surface involves not only cleaning, but also its treatment, which must consider the combination adhesive/material of the adherend.…”

Section: Potential and Challengesmentioning

confidence: 99%

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

Budzik

Wolfahrt

Reis

et al. 2021

The Journal of Adhesion

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The development of new adhesives has allowed to expand the application of bonding into the most diverse industrial fields. This review article presents the commonly used experimental methods for the investigation of mechanical performance of adhesively bonded joints in the aerospace, wind energy, automotive and civil engineering sectors. In these sectors, due to their excellent intrinsic properties, composite materials are often used along with conventional materials such as steel, concrete and aluminium. In this context, and due to the limitations that the traditional joining techniques present, adhesive joints are an excellent alternative. However, standardized experimental procedures are not always applicable for testing representative adhesive joints in these industries. Lack of relevant regulations across the different fields is often overcome by the academia and companies' own regulations and standards. Additional costs are thus mitigated to the industrial sectors in relation with the certification process which effectively can deprive even the biggest companies from promoting adhesive bonding. To ensure continuous growth of the adhesive bonding field the new international standards, focusing on actual adhesive joints' performance rather than on specific application of adhesive joints are necessary.

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Section: Potential and Challengesmentioning

confidence: 99%

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

Budzik

Wolfahrt

Reis

et al. 2021

The Journal of Adhesion

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“…Besides, the cohesive elements of the liquid shims follow a linear traction-separation law as described in the literature. 12,23 Although the JC model parameters may have difference in various papers, it is too little to influence the simulation process and results.…”

Section: Numerical Simulationmentioning

confidence: 99%

Experimental and numerical analyses of the shimming effect on bolted joints with nonuniform gaps

Cheng

Wang

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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In order to investigate the effect of shim compensation for nonuniform gaps in aircraft assembly, the influence of the shims with different material and parameters on bolted joints is studied in this paper. According to the real material and assembly conditions of the aircraft joint structures, the specimen and experiment are designed to obtain the tensile performance of the joint structures with different shims. A three-dimensional finite element model, which incorporates the Johnson–Cook material property of the alloys, traction-separation law of liquid shims, contact relationships between the joint elements, and boundary conditions of the tensile process, is established with the specimen configurations. After validating through comparing with the experimental results, the modeling method is adopted to simulate the tensile response of the bolted joints with shims. Furthermore, both the influence of the shim material and thickness on the mechanical behaviors of bolted joints is investigated in detail. Shims can considerably reduce the assembly stress of joint structures and improve the joint stiffness and load capacity, and this effect is more remarkable with the increase of gap values. Liquid shims improve the joint stiffness due to its cohesive ability, while solid shims improve the joint load capacity. Hybrid shims possess a composite shimming effect of liquid and solid shims. Whatever the shim material is applied, the joint stiffness and strength drop with the growth of shim thickness, so strict deviation control method should be taken to ensure the assembly gaps as small as possible. The research results enhance the knowledge of shimming effect on joint structures, and thus offer positive guidance for practical application in aircraft assembly.

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“…The related parameters are listed in Table I. Besides, the decohesive elements of the liquid shims follow a linear traction-separation law as described in the literature (Pirondi and Moroni, 2009;Domingues et al, 2016).…”

Section: Assembly Automationmentioning

confidence: 99%

Shimming design and optimal selection for non-uniform gaps in wing assembly

Wang

Dou

Cheng

et al. 2017

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Purpose This paper aims to provide a shimming method based on scanned data and finite element analysis (FEA) for a wing box assembly involving non-uniform gaps. The effort of the present work is to deal with gap compensation problem using hybrid shims composed of solid and liquid forms. Design/methodology/approach First, the assembly gaps of the mating components are calculated based on the scanned surfaces. The local gap region is extracted by the seed point and region growth algorithm from the scattered point cloud. Second, with the constraints of hole margin, gap space and shim specification, the optional shimming schemes are designed by the exhaustive searching method. Finally, the three-dimensional model of the real component is reconstructed based on the reverse engineering techniques, such as section lines and sweeping. Using FEA software ABAQUS, the stress distribution and damage status of the joints under tensile load are obtained for optimal scheme selection. Findings With the scanned mating surfaces, the non-uniform gaps are digitally evaluated with accurate measurement and good visualization. By filling the hybrid shims in the assembly gaps, the joint structures possess similar load capacity but stronger initial stiffness compared to the custom-shimmed structures. Practical implications This method has been tested with the interface data of a wing tip, and the results have shown good efficiency and automation of the shimming process. Originality/value The proposed method can decrease the manufacturing cost of shims, shorten the shimming process cycle and improve the assembly efficiency.

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Experimental and numerical failure analysis of aluminium/composite single-L joints

Cited by 40 publications

References 29 publications

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

Experimental and numerical analyses of the shimming effect on bolted joints with nonuniform gaps

Shimming design and optimal selection for non-uniform gaps in wing assembly

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