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Surface toughening – An industrial approach to increase the robustness of pure adhesive joints with film adhesives

Schollerer, Martin and Kosmann, Jens and Holzhüter, Dirk and Bello-Larroche, Carlos and Hühne, Christian (2020) Surface toughening – An industrial approach to increase the robustness of pure adhesive joints with film adhesives. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 234 (13), pp. 1980-1987. Sage Publications. doi: 10.1177/0954410020950071. ISBN ISSN: 0954-4100. ISSN 0954-4100.

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Official URL: https://journals.sagepub.com/doi/full/10.1177/0954410020950071

Abstract

Bonding is known for its wide range of advantages over bolted joints when joining different materials together. However, the advantages e.g. of homogeneous load distribution can quickly be lost in case of overload. For this reason, the load occurring in the adhesive is reduced by constructive measures far below the yield stress of the adhesive, which leads to a conservative joint design. And to be on the safe side, a few “chicken rivets” are then placed again. This problem is particularly well known in aviation. Highly loaded components are structurally bonded by a combination of rivets and adhesive in order to underline the advantages of structural adhesive bonding with the safety of the well-known bolted joints. Known as fail-safe design, this concept is damage tolerant and more robust against manufacturing defects through a secured double load path.  Especially when joining fiber-reinforced composites, bolts weaken the adherends of the joint and only contribute to load transfer when the brittle adhesive fails. With the help of Surface Toughening, a boltless technique for reducing stress concentrations and arresting cracks in adhesive bonded joints is available. This work describes the industrial application of this technique. Starting with coupon tests and a small scale demonstrator to ensure the compatibility with industrial manufacturing processes, such as infusion and prepreg manufacturing, a large scale demonstrator of a 2 m carbon fiber reinforced plastic (CFRP) - HTP leading edge with hybrid laminar flow control is manufactured by the industrial partner AERnnova. Verifying a simple and cost-effective application of the technology, Surface Toughening enables robust bonded joints with a minimum impact on today's process of adhesive bonding.

Item URL in elib:https://elib.dlr.de/136681/
Document Type:Article
Title:Surface toughening – An industrial approach to increase the robustness of pure adhesive joints with film adhesives
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schollerer, Martinmartin.schollerer (at) dlr.dehttps://orcid.org/0000-0001-7015-9461
Kosmann, JensJens.Kosmann (at) dlr.dehttps://orcid.org/0000-0002-2225-4832
Holzhüter, Dirkdirk.holzhueter (at) dlr.dehttps://orcid.org/0000-0003-1001-2366
Bello-Larroche, CarlosUNSPECIFIEDUNSPECIFIED
Hühne, ChristianChristian.Huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Date:13 August 2020
Journal or Publication Title:Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:234
DOI :10.1177/0954410020950071
Page Range:pp. 1980-1987
Publisher:Sage Publications
Series Name:Part G: Journal of Aerospace Engineering
ISSN:0954-4100
ISBN:ISSN: 0954-4100
Status:Published
Keywords:Adhesive bonding, surface toughening, peak stress reduction, strength increasing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Schollerer, Martin
Deposited On:19 Oct 2020 06:41
Last Modified:20 Jun 2021 15:54

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