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Descripción
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| This paper presents a semi-empirical numerical model to predict the residual strength of impacted sandwich panels (composite face-sheets and honeycomb core). The honeycomb core is represented as 3D elements and its material properties take into consideration the change of behaviour of the damaged area due to the impact. This is achieved with different non-linear stress-strain laws for the undamaged and the damaged core. The paper also analyses the properties degradation of the composite face sheets. Plane elements simulate the skin behaviour, and are combined with 3d core elements. Test simulation is performed by implementing region with different mesh densities, and the influence on the strength to compression after impact (CAI) of the whole panel is established. Boundary condition are simulated to complete the standard CAI tests, and the initial damage conditions are established by a few geometric parameters (residual face sheet indentation, core crush dimensions, etc.) obtained from a non destructive inspection (NDI). Finally, comparisons with available CAI test results are provided at the end of the paper. By a non linear analysis, the FEM results have come out as a correct approximation of the experimental test. Furthermore, numerical predictions of residual strength of the panel subjected to compression-after-impact loading have been presented and good agreement with the experiment data from the literature has been found. Results are useful to the better understanding of the progression of the damage and the estimation of a residual strength. | |
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Internacional
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Si |
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Nombre congreso
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Structural Health Monitoring |
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Tipo de participación
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960 |
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Lugar del congreso
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Polonia |
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Revisores
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Si |
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ISBN o ISSN
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978-1-932078-94-7 |
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DOI
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Fecha inicio congreso
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02/07/2008 |
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Fecha fin congreso
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07/07/2008 |
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Desde la página
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459 |
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Hasta la página
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466 |
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Título de las actas
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Structural Health Monitoring |