CRAHVI D4.2.11: Generation of an A321 DRI-KRASH Model

Abstract

This report describes the generation of a full-scale Airbus A321 DRI-KRASH model – a DLR contribution to CRAHVI Task 4.2. The model is used in simulations in Task 4.3 in order to generate inputs for the resulting CRAHVI load database. A large amount of the geometric and property information - required for the development of the KRASH model - was derived from an A321 NASTRAN model provided by Airbus France. A key feature in the DRI-KRASH modelling technique is the pre-definition of the non-linear force-deflection behaviour of larger structural areas. Results of tests which were carried out on A320 sub-structures in an earlier European programme (IMT Programme ‘Crashworthiness for Commercial Aircraft’ /2,3/) were used for the definition of spring characteristics, plastic hinge moments and other non-linear properties in the KRASH model. Some other data, such as the deformation characteristics and failure loads of the engines – in the case of the A321 extremely important in crash landings – could be taken over from an A320 DRI-KRASH stick model which was generated earlier by DLR /5/. This report also gives an overview about structural sections, in which the existing database can be described as insufficient and thus may lead to deficiencies in the KRASH model.