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- Article name
- Modeling of elastic-plastic behavior of flexible cylindrical shells with spatial reinfo rcement structures
- Authors
- YANKOVSKII A. P., , lab4nemir@rambler.ru; yankovsky_ap@rambler.ru, Khristianovich Institute of Theoretical and Applied Mechanics the SB RAS, Novosibirsk, Russia
- Keywords
- cylindrical shells / cylindrical panels / spatial reinforcement / geometric nonlinearity / Reddy theory / elastic-plastic deformation / dynamic loading / cross scheme
- Year
- 2019 Issue 2 Pages 9 - 21
- Code EDN
- Code DOI
- Abstract
- A mathematical model adapted to the application of the explicit numerical scheme "cross" is constructed for inelastic behavior of spatially reinforced flexible cylindrical shells. Elastic-plastic deformation of the materials of the composition components is described by the relations of the flow theory with isotropic hardening. The possible weakened resistance of composite shells to transverse shear is taken into account in the framework of the kinematic Reddy model. The geometric nonlinearity of the problem is considered in the Karman approximation. Dynamic inelastic flexural behavior is investigated for one-directionally-, flat- and spatial-reinforced fiberglass closed cylindrical shells and cylindrical curved panels under the action of loads of explosive type. It is demonstrated that for relatively thick and short closed shells, the replacement of the flat cross-structure of reinforcement by the spatial one leads to a significant decrease of the intensity of deformations in the binding material of the structure. For thin long closed shells, the structure with flat cross-reinforcement is more efficient. It is shown that even in the case of a relatively thin flat cylindrical panel, the replacement of a flat reinforcement structure by a spatial one can lead to a reduction of a few tens of percent of the deflection of the structure module.
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