Computational Methods for Predicting Impact Damage in Composite Structures
Johnson, A, and Pickett, A. (ESI GmbH and Rozycki, P. (2000) Computational Methods for Predicting Impact Damage in Composite Structures. Workshop: Recent Advances in Continuum Damage Mechanics for Composites, LMT-Cachan, 20-22 September 2000.
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This paper describes recent progress on the materials modelling and numerical simulation of the impact response of fibre reinforced composite structures. A continuum damage mechanics (CDM) model for fabric reinforced composites is developed as a framework within which both in-ply and delamination failure may be modelled during impact loads. Damage evolution equations are derived and appropriate materials parameters determined from experiment. The CDM model for in-plane failure has been implemented in a commercial explicit FE code, and new techniques are used to model the laminate as a stack of shell elements tied via contact interface conditions. This approach allows the interlaminar layers and strength reduction due to delamination to be correctly modelled. The code is applied to predict the response of carbon fabric reinforced epoxy plates impacted at different velocities by a steel impactor. A comparison of structural response and failure modes from numerical simulations and impact tests is given which shows a good agreement for the prediction of delamination damage at low impact energies and fracture and penetration at higher impact energies.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Computational Methods for Predicting Impact Damage in Composite Structures|
|Keywords:||crash, impact, survivability, aircraft, simulation, finite element, hybrid|
|Event Title:||Workshop: Recent Advances in Continuum Damage Mechanics for Composites, LMT-Cachan, 20-22 September 2000|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ST - Starrflüglertechnologien|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Institute of Structures and Design|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||16 Sep 2005|
|Last Modified:||14 Jan 2010 22:19|
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