An extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) for free vibration analysis of cracked Reissner-Mindlin shells
M. H. NGUYEN-THOI , L. Le-ANH , V. Ho-HUU , H. Dang-TRUNG , T. NGUYEN-THOI
Front. Struct. Civ. Eng. ›› 2015, Vol. 9 ›› Issue (4) : 341 -358.
An extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) for free vibration analysis of cracked Reissner-Mindlin shells
A cell-based smoothed discrete shear gap method (CS-FEM-DSG3) was recently proposed and proven to be robust for free vibration analyses of Reissner-Mindlin shell. The method improves significantly the accuracy of the solution due to softening effect of the cell-based strain smoothing technique. In addition, due to using only three-node triangular elements generated automatically, the CS-FEM-DSG3 can be applied flexibly for arbitrary complicated geometric domains. However so far, the CS-FEM-DSG3 has been only developed for analyzing intact structures without possessing internal cracks. The paper hence tries to extend the CS-FEM-DSG3 for free vibration analysis of cracked Reissner-Mindlin shells by integrating the original CS-FEM-DSG3 with discontinuous and crack−tip singular enrichment functions of the extended finite element method (XFEM) to give a so-called extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3). The accuracy and reliability of the novel XCS-FEM-DSG3 for free vibration analysis of cracked Reissner-Mindlin shells are investigated through solving three numerical examples and comparing with commercial software ANSYS.
cracked Reissner-Mindlin shell / free vibration analysis / cell-based smoothed discrete shear gap method (CS-FEM-DSG3) / extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) / smoothed finite element methods (SFEM)
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Higher Education Press and Springer-Verlag Berlin Heidelberg
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