On some Features of a Plate Hybrid-Trefftz Displacement Element Containing a Hole

The paper deals with the modelling of riveted assemblies for full-scale complete aircraft crashworthiness. To perform computations aiming at locating rupture initiation in a structure featuring more than 100000 rivets, it is necessary to model the assembly areas using super-elements. If rivet elements have been developed, perforated plate super-elements are still lacking. Thus, the paper focuses on plate super finite element formulations featuring defects, in particular holes. An original eight-node plate element containing a hole has been selected to discuss on the possibility to extend its formulation from linear (elasticity) to non-linear problems (impact). However, since little is known about the features of super-elements containing a hole, it is first attempted to clarify the properties of the selected existing super-element. This kind of element is defined according to the introduced nomenclature, and the features of its interpolation functions are highlighted. The location of stress fields computed by this super-element is proved to be in close agreement with results provided by standard FE calculations. This super-element exhibits also computational efficiency. These features encourage one to pursue the extension of this super-element formulation to large high plastic strains and strain rates, aiming at localising rupture initiation when performing crashworthiness computations of structures with many rivets and holes.

LECONTE Nicolas; 

2010-07-29

ELSEVIER SCIENCE BV

JRC59312

0168-874X,   

www.elsevier.com/locate/finel,    https://publications.jrc.ec.europa.eu/repository/handle/JRC59312,   

10.1016/j.finel.2010.05.001,