Resumen de Amethod for obtaining the dynamic stress history from a flexible multibody simulation using sub-modeling
Tuomas Tapani Rantalainen, Aki Mikkola, Sami Markus Moisio, Gary Burton Marquis
Modern machine structures are often fabricated by welding tens or even hundreds of plate elements. From a fatigue point of view, the structural details, and especially the welded details, are normally most sensitive to fatigue damage and failure. Obtaining the stress history of a structural detail during dynamic simulation is a challenging task, especially when the detail has a complex geometry. In particular, analyzing the stress history of every structural detail within a single finite element model can be overwhelming since the amount of nodal degrees of freedom needed in the model may require an impractical amount of computational effort. This study proposes that the problem can be greatly simplified by using a combination of Floating Frame of Reference Formulation with modal superposition and a sub-modeling approach. In practice, the proposed approach can be used to efficiently generate the relevant fatigue assessment stress history for a structural detail during or after dynamic simulation. In this work, two details for two dynamically loaded boom structures were studied.
