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| Multi-scale coupled numerical analysis of textile composites and structures |
| Received:November 08, 2008 Revised:October 06, 2009 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20106012 |
| KeyWord:textile composites multiple scale coupled analysis repeated unit cell periodic boundary condition |
| Author | Institution |
| 田俊 |
南京航空航天大学 航空宇航学院,南京 |
| 周储伟 |
南京航空航天大学 航空宇航学院,南京 |
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| Abstract: |
| Multi-scale coupled numerical approaches for textile composites and structures were pursued. Firstly, micro- and meso-scale repeated unit cells (RUCs), which represent fiber packing in yarn and periodic braided architectures of textile composites, respectively, were built. The way of average elastic constants prediction of textile composites via multi-scale RUCs was presented. Then, strategy of stress analysis spanning scales of macro structure, meso- and micro RUCs was introduced in detail. To textile composite made panel or shell structures, under in-plane loads, the average in-plane strains of meso RUC is assumed identical. Under out-plane loads, e.g. bending, transverse shear and twisting, the continuous macro-scale stress distributions along thickness are simplified as ladder-like distributions which apply equivalent force and moment. The macro stress grads along thickness are ignored in range of a meso RUC layer. With meso- and micro-scale RUC models, stress transitions from structure to meso-RUC, and then to micro-RUC were achieved. Finally, this multi-scale model was applied to a fictitious square panel made of 3D woven composite. Average elastic constants of the material were calculated, and then, they were employed in structure analysis. By the opposite analysis process, meso- and then micro-scale stress concentrations in given local positions were obtained, respectively. |
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