Failure mechanisms and modelling of impact damage in sandwich beams: A 2D approach. II - Analysis and modelling

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 subinterface cavity surrounded by crushed core while the face sheet remains virtually...

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Bibliographic Details
Published in:The journal of sandwich structures & materials 2003-01, Vol.5 (1), p.33-51
Main Authors: Shipsha, A, Hallstroem, S, Zenkert, D
Format: Article
Language:English
Online Access:Get full text
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Summary: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 subinterface cavity surrounded by crushed core while the face sheet remains virtually undamaged. Parameterized 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 nonlinear 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.
ISSN:1099-6362
DOI:10.1106/109963603024585