期刊
COMPOSITES PART B-ENGINEERING
卷 77, 期 -, 页码 179-193出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2015.03.036
关键词
Fracture; Buckling; Plates; Extended finite method; Finite element analysis (FEA)
资金
- Japan Society for the Promotion of Science (JSPS) [26-04055, P14055]
- National Natural Science Foundation of China [51179063]
- National Sci-Tech Support Plan of China [2015BAB07B10]
- Sci-Tech Support Plan of Hunan Province [2014WK2026]
- Grants-in-Aid for Scientific Research [14F04055] Funding Source: KAKEN
We present new numerical results in buckling failure analysis of cracked composite functionally graded plates subjected to uniaxial and biaxial compression loads. An accurate extended 3-node triangular plate element in the context of the extended finite element method (XFEM) is developed, integrating the discrete shear gap method (DSG) to eliminate shear-locking. The plate kinematics is based on the Reissner-Mindlin theory, and material properties are assumed to vary through thickness direction, obeying a power law distribution. The developed DSG-XFEM is found to be effective and accurate as it owns many desirable advantages: conveniently representing crack geometry which is independent of the mesh; shear-locking effect is no longer valid; mesh distortion is insensitive and controllable; thin plates is possible; triangular elements are easily generated for problems even with complex geometries; and high accuracy. All these arisen features are demonstrated through numerical examples and the effects of crack-length, material gradation, mesh distortion, inclined angles of cracks, boundary conditions, width-to-thickness ratio, length ratio, etc. on the critical buckling coefficient (CBC) are analyzed. Numerical results reveal that the material gradation, crack-length, thickness, length ratios, etc. have a strong effect on the behavior of CBC. This phenomenon is mainly attributed to the plate stiffness degradation due to the presence of local defects and material composition. Also, the boundary conditions greatly alter the CBC whereas the inclination of cracked angle is found to be insignificant. (C) 2015 Elsevier Ltd. All rights reserved.
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