Toward a Hybrid-Trefftz element with a hole for elasto-plasticity?

JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS

卷:218

Article; Proceedings Paper

Leconte, Nicolas¹  Langrand, Bertrand¹  Markiewicz, Eric² 

[1] French Aerosp Lab ONERA DMSE, F-59000 Lille, France

[2] Univ Valenciennes LAMIH, F-59313 Valenciennes, France

关键词: hybrid FEM;    complex variable;    structural embrittlement;    riveted assemblies;    crashworthiness;   

DOI  :  10.1016/j.cam.2007.04.034

来源: Elsevier

【 摘 要 】

The paper deals with the modelling of riveted assemblies for full-scale complete aircraft crashworthiness. Many comparisons between experiments and FE computations of bird impacts onto aluminium riveted panels have shown that macroscopic plastic strains were not sufficiently developed (and localised) in the riveted shell FE in the impact area. Consequently, FE models never succeed in initialising and propagating the rupture in the sheet metal plates and along rivet rows as shown by experiments, without calibrating the input data (especially the damage and failure properties of the riveted shell FE). To model the assembly correctly, it appears necessary to investigate on FE techniques such as Hybrid-Trefftz finite element method (H-T FEM). Indeed, perforated FE plates developed for elastic problems, based on a Hybrid-Treffiz formulation, have been found in the open literature. Our purpose is to find a way to extend this formulation so that the super-element can be used for crashworthiness To reach this aim, the main features of an elastic Hybrid-Treffiz plate are presented and are then followed by a discussion on the possible extensions. Finally, the interpolation functions of the element are evaluated numerically. (C) 2007 Elsevier B.V. All rights reserved.

【 授权许可】

Free