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| Postbuckling of laminated composite with multiple delaminations |
| Revised:July 18, 2003 |
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| DOI：10.7511/jslx20046128 |
| KeyWord:composite panel,multiple penetrating delaminations,post-buckling,nonlinear FEM,reference surface finite element,virtual bar element |
| Zhu Jufen~ |
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| Abstract: |
| Based on Mindlin assumption and the moderate large-deformation plate/shell theory, a nonlinear numerical model is presented to analyze the post-buckling behavior of a composite panel embedded with multiple penetrating delaminations. A 4-node reference surface plate/shell element combining with a virtual bar element is employed to numerically solve the nonlinear buckling equations using a revising arc-length iteration scheme. The virtual bar element is used to take into account the contact effect on the interface between the two adjacent sub-beams, i.e., to prevent the two adjacent sub-delaminations penetrating into each other. Numerical examples demonstrate the effectiveness of the proposed model and iteration algorithm. The effect of depth, number and size of delaminations on the post-buckling properties of delaminated panels is emphatically studied and some salient conclusions are drawn in this paper. |
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