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Theses

Méthode global/local non-intrusive pour les simulations cycliques non-linéaires

Abstract : This thesis consists in developing innovating tools destined to the simulation of aeronautical structures evolving at high temperature. Indeed, working rates of current engines lead to an elasto-viscoplastic evolution generalized in metallic parts and the use of simplified models (linear elastic) are no longer totally satisfying in term of accuracy, even in initial design process. Likewise, the complex geometry allowing the continuous cool down process of parts (micro-perforations) has to be exactly taken into account. The standard computation techniques dedicated to this kind of models would lead to slow simulations with a lack of flexibility (the slightest modifications leading to restart the whole design process of the computation chain).More precisely, this thesis extends the noninvasive global/local methods to the framework of viscoplasticity generalized to the whole structure, using two scales in time and space, each one adapted to global and local phenomena to capture. The method is then extended to the computation of high number of complex load cycles, by skipped cycles techniques. The time coupling scheme lets then a local adaptation of time steps per subdomain. Convergence acceleration techniques are also set up, first for one time step and then through several load cycles (skipped cycles). These developments conduct to obtain quickly an evaluation of the limit cycle providing data to a lifetime expectancy model.The noninvasive coupling is realized in a programming language script managing the commercial software (respectively in our case Python and Abaqus/Standard). The method has been applied on industrial computational platforms, by reusing directly meshes and data from previous engineering tasks appearing earlier in the computational chain. A genuine test case from a Safran Aircraft Engines design office, was performed successfully.
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https://tel.archives-ouvertes.fr/tel-01852574
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Submitted on : Thursday, August 2, 2018 - 1:05:12 AM
Last modification on : Tuesday, October 6, 2020 - 8:24:04 AM
Long-term archiving on: : Saturday, November 3, 2018 - 12:50:55 PM

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  • HAL Id : tel-01852574, version 1

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Maxime Blanchard. Méthode global/local non-intrusive pour les simulations cycliques non-linéaires. Mécanique des solides [physics.class-ph]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLN003⟩. ⟨tel-01852574⟩

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