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SIZE REDUCED COMPOSITE REPAIRS BY PLY WISE SCARFING

Holzhüter, Dirk and Kosmann, Jens and Hühne, Christian and Sinapius, Michael and Schollerer, Martin (2016) SIZE REDUCED COMPOSITE REPAIRS BY PLY WISE SCARFING. ECCM17 - 17th European Conference on Composite Materials, 27.6.2016 - 30.6.2016, München.

Full text not available from this repository.

Abstract

Scarf repairs of aerospace composite structures are today’s preferred technology. It is known that the shear stress distribution of the adhesive is inhomogeneous within the scarf. It depends on the stacking sequence and the scarf ratio. Main stress peaks are located at the interfaces of the 0 layers within the adhesive. A higher scarf ratio reduces these stress peaks at the cost of an increased joint size. A comprehensive study has been performed developing a methodology to reduce these shear stress peeks within state of the art composite scarf joints. The proposed method is a layer wise adaptation of the scarf ratio. Presented analytical calculations outline the concepts feasibility. An increased joint strength of layer wise scarfed coupons compared to constant ones is experimentally validated. Initial results show an increase in joint strength up to 50%. This improvement is a first step on the way towards size reduced composite repairs. The study’s results are relevant to increase the number of bonded repairs under current certification restrictions and to develop high strength composite scarf joints.

Item URL in elib:https://elib.dlr.de/105414/
Document Type:Conference or Workshop Item (Speech)
Title:SIZE REDUCED COMPOSITE REPAIRS BY PLY WISE SCARFING
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Holzhüter, DirkDirk.Holzhueter (at) dlr.deUNSPECIFIED
Kosmann, JensJens.Kosmann (at) dlr.deUNSPECIFIED
Hühne, ChristianChristian.Huehne (at) dlr.deUNSPECIFIED
Sinapius, MichaelMichael.Sinapius (at) dlr.deUNSPECIFIED
Schollerer, MartinMartin.Schollerer (at) dlr.deUNSPECIFIED
Date:July 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:bonded repair, scarf joint, scarf repair, layer wise scarfing, composite repair
Event Title:ECCM17 - 17th European Conference on Composite Materials
Event Location:München
Event Type:international Conference
Event Dates:27.6.2016 - 30.6.2016
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
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Holzhüter, Dirk
Deposited On:16 Oct 2016 11:48
Last Modified:16 Oct 2016 11:48

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