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Experimental Investigations of the Disbond Stopping Capability of a Novel Epoxy-Thermoplastic Bondline Architecture for Composite Joints

Löbel, Thomas and Kühn, Markus and Holzhüter, Dirk and Hühne, Christian (2014) Experimental Investigations of the Disbond Stopping Capability of a Novel Epoxy-Thermoplastic Bondline Architecture for Composite Joints. In: Proceedings of the 16th European Conference on Composite Materials. ECCM-16, 22.-26. Jun. 2014, Sevilla, Spanien.

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Abstract

A novel bondline architecture for bonded composite joints is presented. By implementing a distinct rather ductile thermoplastic phase, a physical barrier for growing disbonds is obtained and thus a more fail-safe design, respectively. Furthermore, the joint is established by using two different joining technologies, namely adhesive bonding and thermoset composite welding. A possible manufacturing technique is briefly described and assessed by means of Double Cantilever Beam (DCB) and Single Lap Shear (SLS) tests. The thermoplastic phase constrains disbonds by posing a physical barrier through a discrete change of materials. Thus, a significant increase against crack propagation is observed for DCB tests. However, visual examinations of the transition zone between both adhesive materials disclose sensitivity to a thickness mismatch between both materials leading to adhesion deficiencies in the vicinity of the thermoplast.

Item URL in elib:https://elib.dlr.de/90747/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental Investigations of the Disbond Stopping Capability of a Novel Epoxy-Thermoplastic Bondline Architecture for Composite Joints
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Löbel, ThomasThomas.Loebel (at) dlr.deUNSPECIFIED
Kühn, MarkusUNSPECIFIEDUNSPECIFIED
Holzhüter, Dirkdirk.holzhüter (at) dlr.deUNSPECIFIED
Hühne, Christianchristian.huehne (at) dlr.deUNSPECIFIED
Date:June 2014
Journal or Publication Title:Proceedings of the 16th European Conference on Composite Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Adhesive bonding, Disbond stopping, Bondline architecture, Fracture toughness
Event Title:ECCM-16
Event Location:Sevilla, Spanien
Event Type:international Conference
Event Dates:22.-26. Jun. 2014
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: Löbel, Thomas
Deposited On:18 Mar 2015 08:21
Last Modified:18 Mar 2015 08:21

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