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This and the next three slides are from:
K.C. Gopalakrishnan (1) and R. Rameshkumar (2)
(1) Dept. of Mechanical Engineering, College of Engineering, Trivandrum, Kerala, India
(2) Honeycomb Product Development Division, SDEG, Vikram Sarabhai Space Center, Trivandrum, Kerala, India
“Failure assessment of CFRP skinned honeycomb sandwich beam with delamination using cohesive zone model”, International Journal of Engineering Research and Applications (IJERA), Vol. 1, No. 3, pp 1040-1050, ISSN: 2248-9622, year of publication not given in the pdf file.
ABSTRACT: Cohesive zone model to capture the failure behaviour and strength of CFRP skinned cantilever sandwich beam with delamination is carried out and verified through test. The inputs required to represent the interfacial behaviour between the skin and honeycomb core in cohesive zone model are determined by standard tests. Acoustic emission was monitored during the test. Comparison of the load-displacement response obtained shows a good agreement with the experimental result. Both the test and analysis show a buckling induced delamination resulting earlier buckling failure of the specimen. Prediction of failure load based on nonlinear buckling analysis with CZM and without CZM approach shows a deviation of 6 % and 9% respectively with the test. The present study reveals that coupled buckling induced delamination failure of bonded sandwich structures can be accurately predicted by cohesive zone model which incorporates debond growth and buckling simultaneously. Parametric study reveals that the interfacial strength plays a key role in failure load of adhesively bonded sandwich structures in comparison to the delamination fracture toughness.
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