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Дисертації з теми "Méthode de chargements équivalents en fatigue"
Warneboldt, Iona. "Multiaxial fatigue design of elastomeric parts using Equivalent Fatigue Loads." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2022. http://www.theses.fr/2022ENTA0002.
Повний текст джерелаThis thesis introduces an Equivalent Fatigue Load (EFL) approach for the multiaxial fatigue design of elastomeric parts. As direct Finite Element Analysis (FEA) calculations of automotive in-service loads (Road Load Data (RLD)) are too expensive, the objective is to derive simplified load blocks as a realistic input for numerical damage calculations. Three streps are applied for this method: the localization method, the material damage function and the EFL determination process. Various fatigue tests have been conducted (415 samples) to study the fatigue behavior of this complex type of relaxing and non-relaxing multiaxial loading on natural rubber specimens. Lifetime and crack features are analyzed to eventually introduce an appropriate critical planebased fatigue measure and to establish a novel mean strain effect model. This criterion is generalized throughout an original critical plane search method. To estimate the local mechanical response (localization method), this thesis identifies an axes-coupling method that is fitted for the nonlinear nature of elastomeric structures. It is based on the multiplicative decomposition of the deformation gradient tensors. These two steps are then implemented in the framework of the EFLdetermination process. For this, a global optimization method is added to determine the simplified load blocks, causing locally the same fatigue behavior in the given structure. The computational costs of this optimization are reduced by only considering a subset of the most damaged material points for EFLdetermination. Finally, the method has been challenged on a specimen to outline its capabilities and to validate the approach
Feng, Liqun. "Plasticité et fatigue sous chargements aléatoires." Paris 6, 1987. http://www.theses.fr/1987PA066164.
Повний текст джерелаBia, Ahmed. "Modélisation de la propagation d'une fissure de fatigue après application des chargements à amplitudes variables." Metz, 1986. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1986/Bia.Ahmed.SMZ8612.pdf.
Повний текст джерелаThe modelisation of the propagation submissive at a constant amplitude loading after one overload was realized, starting from three methods : analytical method, finite elements method, method based on the dislocations theory. Analytical, finite elements and dislocations methods, and experimental results are compared
Nesnas, Karim. "Sur des méthodes numériques de calcul de structures sous chargements cycliques." Compiègne, 1998. http://www.theses.fr/1998COMP1144.
Повний текст джерелаLi, Changle. "Application de la méthode d'analyse simplifiée des structures inélastiques à la fatigue de contact." Lille 1, 2004. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2004/50376-2004-233.pdf.
Повний текст джерелаRoudet, Francine. "Comportement en flexion trois points avec cisaillement prépondérant de composites verre-époxyde unidirectionnels : sous chargements monotone et cyclique." Lille 1, 1998. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1998/50376-1998-439.pdf.
Повний текст джерелаGoutal, Caroline. "Dimensionnement en fatigue en présence de singularités macroscopiques dans un thermoplastique renforcé fibres de verre courtes (PA66GF50) sous chargements uni- et multi-axiaux." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0008.
Повний текст джерелаIn the current environmental context, the automotive industry looks for reducing CO2 emissions while keeping vehicles power. To this aim, a solution is to lighten the vehicles. In this context, this Ph.D. thesis, supported by Solvay Engineering Plastics in collaboration with Vibracoustic, deals with fatigue resistance of injected parts in Polyamide 6.6reinforced by 50% wt. of short glass fibers, and attempts to take into account the effects of multiaxial loadings and geometrical singularities into a fatigue design methodology. The study is conducted for a given conditioning(RH50%,T80°C) representative of the atmospheric conditions experienced by motor mounts. A fully integrated numerical approach from injection simulation to lifetime prediction by a fatigue criterion, named Through Process Modelling (TPM), is used. One TPM specificity lies in the calculation of the local mechanical response at each point of the part from a multi-scale approach considering the matrix viscoelasticity and the fibers orientation due to the injection process. The fatigue criterion selected is a dissipated energy one. It is based on a “Fatigue Indicator Parameter” (FIP) assimilated to the stress-strain loop area in the stationary regime and obtained by post-treatment of mechanical fields at each point of the part.First, the matrix constitutive law is identified by reverse engineering. Then, the question of the discretization to be adopted in the thickness of an injected part is addressed on smooth samples, and the identification strategy of the fatigue criterion is defined. Subsequently, TPM is applied to a large fatigue database, specifically built for the study, and involving samples and loadings with increasing complexity. Uniaxial tension loadings are studied, firstly on smooth samples (with different fibers orientations), then on pipes, and finally on notched samples. Shear loadings on butterfly samples and torsion loadings on pipes are studied. At last, pipes under combined tension-torsion are considered. For each loading and each singularity level, attention is paid to the definition of a volume around the singularity onwhich the FIP should be spatially averaged. The definition relies on the mechanical gradients analysis. The TPM provides thus lifetimes predictions close to experimental ones in most of the studied configurations
Meriaux, Jean. "Etude expérimentale et modélisation de l'endommagement du contact aube-disque de soufflante soumis à des chargements de fretting fatigue." Phd thesis, Ecole Centrale de Lyon, 2010. http://tel.archives-ouvertes.fr/tel-00730679.
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