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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Document, Thesis/dissertation, Internet resource |
Document Type: | Internet Resource, Computer File |
All Authors / Contributors: |
Benjamin Fulleringer; Daniel Nélias; Institut national des sciences appliquées de Lyon (Lyon).; Ecole Doctorale Mecanique, Energetique, Genie Civil, Acoustique (MEGA) (Villeurbanne).; LaMCoS - Laboratoire de Mécanique des Contacts et des Structures, UMR 5259 (Lyon, INSA). |
OCLC Number: | 800942982 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Benjamin Fulleringer ; sous la direction de Daniel Nélias. |
Abstract:
Fan blade roots of jet engines are operating under fretting sollicitations. This results in two types of damage: (i) initiation and crack propagation, and (ii) wear of contact surfaces. OBJECTIVE: A semi-analytical method has been developed in order to solve the industrial problem. This method is fast-computing and able to deal with elastic-plastic coated contacts and / or heterogeneous, and has bee developed from existing items and innovative analytical and numerical solutions. METHOD: The structure is simplified by assuming two semi-infinite elastic solid in contact, and analytical solutions for: + Contributions of elementary normal and tangential loads constant over a rectangular area + Contributions of elementary plastic strains constant on a parallelepiped + Contributions basic incompatibility of deformations related to a heterogeneous (inclusions, coatings, damage ,...) constant on a parallelepiped. >> on surface displacements and stresses in the volume. Surface displacements and stresses in the volume are then expressed using discrete convolution products (2D or 3D-FFT) between the coefficients of influence and the surfacic (loading surface) or volumic (plastic deformation or inconsistency) source. The normal and tangential problems in both the gross-slip and stick-slip regime can be solved, taking into account the effect of plasticity and heterogeneities. The contact algorithm used (elastic contact) has been developed by L. Gallego while the base of the plastic solver has been developed by C. Jacq (frictionless elastic-plastic contact) RESULTS: New analytical solutions are given for calculating the residual tangential displacements.
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