Community Research and Development Information Service - CORDIS

Design of bonded structures by finite element analysis

The contribution to the selection, design and construction of the FINCANTIERI AC1 fairings and AC6 casings bonded prototypes improved the know-how of Cetena in this field. Several FEM calculations have been performed on those structures, to improve their design and to evaluate the stress levels both in structure and in the joint under the selected loading conditions.

The possibility to model a bonded joints within a global coarse FE model has been investigated. In 4-41-D-2001-01-0 Preliminary design of prototypes Fincantieri AC6 (external casings); the joint between the deck and the casing has been modelled within a complete 3D FE model of a ship, and analysed in the context of a global bending deflection of the hull. Detailed fine models of both ACs have then been built and analysed, focusing the attention on local effects arising from global and local loads on bonded joints.

Different modelling approaches have been experimented investigating the effects of:
- Different model refinements,
- Different element types: 8 node brick, 20 node brick,
- Different formulations: compressible and incompressible-Hermann formulation,
- Different solution procedures: total Lagrangian, updated Lagrangian,
- Different material formulations, Mooney, Ogden.

Leading to a knowledge improvement about the behaviour of bonded structures and about modelling and analysis methods. Experience acquired within the project allows an accurate strength evaluation of bonded joints, by using finite element approach.

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