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Failure mechanisms and modelling of impact damage in sandwich beams - A 2D approach: Part II - Analysis and modelling
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0002-9207-3404
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0002-9744-4550
2003 (English)In: Journal of Sandwich Structures and Materials, ISSN 1099-6362, E-ISSN 1530-7972, Vol. 5, no 1, 33-51 p.Article in journal (Refereed) Published
Abstract [en]

This study addresses the effect of low velocity impact damage on the post-impact residual strength and failure mechanisms of sandwich beams with Rohacell WF51 foam core. The considered impact damage has a form of a sub-interface cavity surrounded by crushed core while the face sheet remains virtually undamaged. Part I of this study deals with experimental investigation of impact-damaged beams tested in transverse shear, bending and edgewise compression. It is shown that the crushed core and the bridging condition in the peripheral regions of the impact damage exert a significant effect on the post-impact critical loads and failure mechanisms. In this paper, parameterised finite element (FE) models of impact damage with implemented crushed core properties are developed for numerical analyses of post-impact failure. In the analysis of the shear case, a model for II bridging condition in the peripheral regions of impact damage is introduced. A point-stress criterion is applied for predictions of failure loads and crack kink angle. Geometrically non-linear FE analysis is employed for evaluation of critical loads for local buckling in the beams with impact damage. The FE analyses demonstrate good agreement with experimental results.

Place, publisher, year, edition, pages
2003. Vol. 5, no 1, 33-51 p.
Keyword [en]
expanded pvc foam, shear properties, fracture, composite, cracks, core, compression, specimens, behavior, defects
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-22246DOI: 10.1177/1099636203005001585ISI: 000180965500002OAI: oai:DiVA.org:kth-22246DiVA: diva2:340944
Note
QC 20100525 NR 20140804Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Hallström, StefanZenkert, Dan

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