期刊
ENGINEERING FRACTURE MECHANICS
卷 76, 期 4, 页码 594-613出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2008.12.008
关键词
Debond failure mode; Sandwich structures; Mixed mode bending; Finite element analysis; Experimental mechanics
类别
资金
- Danish Research Agency [274-05-0324]
- Otto Monsted's Foundation
The mixed mode bending specimen originally developed for mixed mode delamination fracture characterization of unidirectional composites has been extended to the study of debond propagation in foam cored sandwich specimens. The compliance and strain energy release rate expressions for the mixed mode bending sandwich specimen are derived based on a superposition analysis of solutions for the double cantilever beam and cracked sandwich beam specimens by applying a proper kinematic relationship for the specimen deformation combined with the loading provided by the test rig. This analysis provides also expressions for the global mode mixities. An extensive parametric analysis to improve the understanding of the influence of loading conditions, specimen geometry and mechanical properties of the face and core materials has been performed using the derived expressions and finite element analysis. The mixed mode bending compliance and energy release rate predictions were in good agreement with finite element results. Furthermore, the numerical crack surface displacement extrapolation method implemented in finite element analysis was applied to determine the local mode mixity at the tip of the debond. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
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