Vol. 4, No. 7-8, 2009

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ISSN: 1559-3959
Failure investigation of debonded sandwich columns: An experimental and numerical study

Ramin Moslemian, Christian Berggreen, Leif A. Carlsson and Francis Aviles

Vol. 4 (2009), No. 7-8, 1469–1487
Abstract
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Failure of compression loaded sandwich columns with an implanted through-width face/core debond is examined. Compression tests were conducted on sandwich columns containing implemented face/core debonds. The strains and out-of-plane displacements of the debonded region were monitored using the digital image correlation technique. Finite element analysis and linear elastic fracture mechanics were employed to predict the critical instability load and compression strength of the columns. Energy release rate and mode mixity were determined and compared to fracture toughness data obtained from TSD (tilted sandwich debond) tests, predicting propagation loads. Instability loads of the columns were determined from the out-of-plane displacements using the Southwell method. The finite element estimates of debond propagation and instability loads are in overall agreement with experimental results. The proximity of the debond propagation loads and the instability loads shows the importance of instability in connection with the debond propagation of sandwich columns.

Keywords
sandwich structures, columns, debond damages, buckling, fracture mechanics, compressive strength
Milestones
Received: 14 April 2009
Revised: 29 May 2009
Accepted: 30 May 2009
Published: 26 December 2009
Authors
Ramin Moslemian
Department of Mechanical Engineering
Technical University of Denmark
Nils Koppels Allé, Building 403
2800 Kongens Lyngby
Denmark
Christian Berggreen
Department of Mechanical Engineering
Technical University of Denmark
Nils Koppels Allé, Building 403
2800 Kongens Lyngby
Denmark
Leif A. Carlsson
Department of Mechanical Engineering
Florida Atlantic University
777 Glades Road
Boca Raton, FL 33431
United States
Francis Aviles
Centro de Investigación Científica de Yucatán
A.C. Unidad de Materiales
Calle 43, No. 103
Colonia Chuburná de Hidalgo
CP 97200 Mérida, Yucatán
Mexico