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FROM:
K.C. Gopalakrishnan (1), R. Ramesh Kumar (2) and S. Anil Lal (1)
(1) Department of Mechanical Engineering, College of Engineering, Trivandrum, India
(2) Honeycomb Product Development Division, SDEG Vikram Sarabhai Space Centre, ISRO, Trivandrum, India
“Cohesive zone modeling of coupled buckling – debond growth in metallic honeycomb sandwich structure”, Journal of Sandwich Structures and Materials, Vol. 14, No. 6, pp 679-693, November 2012
ABSTRACT: Buckling-induced skin–core debond growth in honeycomb sandwich cantilever beam is demonstrated using a cohesive zone model. The input parameters for the analysis are interfacial bond strength, mode I and mode II interfacial fracture toughness values, obtained from flatwise tension tests, drum-peel tests and three-point end notch flexure tests, respectively. Debonded honeycomb specimens are tested and the acoustic emission technique was used to observe the initiation of the debond growth. The load-displacement response from the cohesive zone model model shows a good agreement with the experimental results. The conventional analysis without cohesive zone model overestimates failure load by 56%. Cohesive zone model is able to predict the coupled debond growth and buckling failure in honeycomb sandwich structures.
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