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Comparison of Stepped and Straight Design of Bonded Scarf Joints

Holzhüter, Dirk and Kosmann, Jens and Völkerink, Oliver and Schollerer, Martin and Hühne, Christian (2018) Comparison of Stepped and Straight Design of Bonded Scarf Joints. 12th European Adhesion Conference, 5.9.2018 - 7.9.2018, Lissabon.

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Structural bonding and bonded repairs of composite materials become more and more important in aerospace industry. Depending on the application, two different repair designs are common in the repair of aircraft structures – Straight scarf and stepped lap repairs. From a sole mechanical point of view straight scarfs are more efficient compared to stepped joints. Peel stresses are minimized due to the smoother contour. A recent experimental study conducted by the author’s partners in the German national research project FACTOR (funded by the German Ministry of Commerce) showed a differing behavior. Two scarf ratios (1:20 and 1:40) for a straight as well as a stepped design are investigated giving unexpected results. The presented work summarizes the experimental data and explains the necessity of a numerical study. Several numerical simulations are carried out validating the experimental data. A 2D plain strain model is used to investigate the influence of several parameters. Material data for the parent laminate, the repair laminate and the repair adhesive are derived from literature. The geometrical and material non-linear simulations are described and four joint configurations analysed. The differing failure cascades and the specific characteristics of the investigated stacking sequence are discussed. Recommendations for future experimental designs to study the difference of repair configurations are given

Item URL in elib:https://elib.dlr.de/121638/
Document Type:Conference or Workshop Item (Speech)
Title:Comparison of Stepped and Straight Design of Bonded Scarf Joints
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Holzhüter, Dirkdirk.holzhueter (at) dlr.dehttps://orcid.org/0000-0003-1001-2366
Kosmann, JensJens.Kosmann (at) dlr.dehttps://orcid.org/0000-0002-2225-4832
Völkerink, Oliveroliver.voelkerink (at) dlr.deUNSPECIFIED
Schollerer, MartinMartin.Schollerer (at) dlr.dehttps://orcid.org/0000-0001-7015-9461
Hühne, Christianchristian.huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Date:5 September 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
EditorsEmailEditor's ORCID iD
da Silva, Lucas F MFaculdade de Engenharia da Universidade do PortoUNSPECIFIED
Keywords:adhesive bonding,adhesive repair, scarf repair, stepped repair, composites, composite repair, joint design
Event Title:12th European Adhesion Conference
Event Location:Lissabon
Event Type:international Conference
Event Dates:5.9.2018 - 7.9.2018
Organizer:European Adhesion society
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: Holzhüter, Dirk
Deposited On:13 Dec 2018 06:08
Last Modified:13 Dec 2018 06:08

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