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Criteria for skin rupture and core shear cracking induced by impact on sandwich panels
RISE, Swerea, SICOMP.ORCID iD: 0000-0002-2627-3280
Faserinstitut Bremen e.V., Germany; Nordex Energy GmbH, Germany.
2015 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 125, p. 81-87Article in journal (Refereed) Published
Abstract [en]

Core shear cracking induced by impact on sandwich panels is a critical failure mode causing severe loss of structural performance. This paper reviews previous experimental and theoretical work in the area and derives improved closed form expressions for initiation of skin rupture and core shear cracking during impact on sandwich panels with foam cores. The criterion for skin rupture is also applicable to laminates without a core. It is shown that the skin rupture load limits the achievable core shear load, and that core shear cracking can be prevented by selecting a core thickness above a certain threshold value. The criteria are successfully validated by comparison with experimental results for a range of thicknesses of skins and cores in panels with carbon/epoxy skins and a Rohacell foam core. The criterion for skin rupture is also validated for plain laminates.

Place, publisher, year, edition, pages
Elsevier Ltd , 2015. Vol. 125, p. 81-87
Keywords [en]
Analysis: analytical modelling, Fabrics/textiles, Material: carbon fibre, Property: impact behaviour, Carbon, Carbon fibers, Composite beams and girders, Foams, Honeycomb structures, Sandwich structures, Carbon/epoxy, Closed-form expression, Critical failures, Impact behaviour, Sandwich panel, Structural performance, Threshold-value, Cracks
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40989DOI: 10.1016/j.compstruct.2015.01.028Scopus ID: 2-s2.0-84922995806OAI: oai:DiVA.org:ri-40989DiVA, id: diva2:1377041
Note

Funding details: Bureau of Energy, Ministry of Economic Affairs, Republic of Taiwan, IV-2; Funding text 1: The authors thank the CTC Stade GmbH for manufacturing of the test specimens as well as Martin Rinker and Marianne John of the Fraunhofer Institute for Mechanics of Materials in Halle, Germany for impact testing of the specimens. The impact tests were funded by the German Federal Ministry for Economic Affairs and Energy through the Federal Aeronautical Research Program IV (LuFo IV-2) within the project LoKosT. The authors gratefully acknowledge this support.

Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2019-12-10Bibliographically approved

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Olsson, Robin

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