|
|
||
|
|
|
|
From:
Alastair F. Johnson (1) and Anthony K. Pickett (2)
(1) German Aerospace Center (DLR)
Institute of Structures and Design, Stuttgart, Germany
(2) Engineering Systems International GmbH Eschborn, Germany
“Impact And Crash Modelling Of Composite Structures: A Challenge For Damage Mechanics”, (publisher and date of publication is not given in the pdf file)
ABSTRACT: The paper describes recent progress on the materials modelling and numerical simulation of the impact and crash response of fibre reinforced composite structures. The work is based on the application of explicit finite element (FE) analysis codes to composite aircraft structures under both low velocity crash and high velocity impact conditions. Detailed results are presented for the crash response of helicopter subfloor box structures using a strain based damage and failure criterion for fabric reinforced composites. In order to obtain better agreement with measured impact response, an improved composites damage mechanics model with damage parameters as internal state variables is presented. Improved models for predicting delamination are also considered and a novel approach is presented in which a composite laminate is modelled numerically by stacked shell elements with contact interfaces whose delamination is controlled by fracture mechanics criteria.
Page 102 / 410