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Failure mode shifts during constant amplitude fatigue loading of GFRP/foam core sandwich beams
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-9744-4550
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-1187-4796
2011 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 33, no 2, 217-222 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents fatigue results for sandwich beams that exhibit a transition in failure mode, from core shear failure to face laminate tensile failure, as function of load amplitude only. The basis of this are fatigue tests of foam cores in shear and tensile tests on composite laminates. These results show that the slopes of the stress-life (S-N) relation are different for the core and laminates. By using the obtained stress-life relations, a simple design scheme is given for sandwich beams which are anticipated to have a transition of failure mode for a particular load level. Two designs are manufactured and tested in fatigue under constant amplitude loading. The results clearly show the aim of investigation with transitions in failure modes giving a structural stress-life diagram a bi-linear shape. For high load and small number of cycles to failure, the beams fail by core shear fracture while for lower loads, and large number of cycles to failure the beams fail by face sheet tensile failure.

Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 33, no 2, 217-222 p.
Keyword [en]
Fatigue life, Sandwich beam, Composite, Foam core, Failure modes
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-65726DOI: 10.1016/j.ijfatigue.2010.08.005ISI: 000283908400015Scopus ID: 2-s2.0-77957881925OAI: oai:DiVA.org:kth-65726DiVA: diva2:483555
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20120125

Available from: 2012-01-25 Created: 2012-01-25 Last updated: 2017-12-08Bibliographically approved

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Zenkert, DanBurman, Magnus

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