  Arbitrary Lagrangian Eulerian Modelling of Tension LevellingBoman, Romain  ; ; et alin Matériaux et Techniques (2012, October), 100(Hors série 2012), 40-42 This paper presents a two-dimensional model of tension levelling using the Arbitrary Lagrangian Eulerian (ALE) approach. During the simulation, the ALE mesh remains globally fixed along the rolling ... [more ▼] This paper presents a two-dimensional model of tension levelling using the Arbitrary Lagrangian Eulerian (ALE) approach. During the simulation, the ALE mesh remains globally fixed along the rolling direction. Therefore, the required number of finite elements is much smaller than in the Lagrangian case and smaller CPU times are obtained for the same accuracy on the results. The ALE model is first validated against a classical equivalent Lagrangian model. Then, both sets of numerical results are compared to experimental measurements from the pilot mill of ArcelorMittal Maizières R&D. [less ▲] Detailed reference viewed: 34 (3 ULg)Simulation of complex impact problems with implicit time algorithms. Application to crashworthiness problemsNoels, Ludovic ; Stainier, Laurent ; Ponthot, Jean-Philippe in Matériaux et Techniques (2004) Recently, robust implicit energy and momentum conserving algorithms have been developed in the non-linear range. The authors extended these algorithms to hypoelasticity-based constitutive models and ... [more ▼] Recently, robust implicit energy and momentum conserving algorithms have been developed in the non-linear range. The authors extended these algorithms to hypoelasticity-based constitutive models and introduced numerical dissipation, opening the way to more complex simulations such as blade-loss in a turbofan. [less ▲] Detailed reference viewed: 33 (2 ULg)Influences physico-chimiques sur le comportement tribologique des résines polyimides; Bozet, Jean-Luc in Matériaux et Techniques (1995), (n° 5-6,), 43-48 Physical and chemical properties vary with temperature. In a sliding contact between a pair of materials, high speeds can provoke a rise of the temperature of these materials due to the heat produced by ... [more ▼] Physical and chemical properties vary with temperature. In a sliding contact between a pair of materials, high speeds can provoke a rise of the temperature of these materials due to the heat produced by friction. Consequently, the increase of temperature can modify physical and chemical properties affecting their tribological behaviour. Tribological tests performed on polyimide resins sliding against austenitic stainless steel indicate that there is a friction transition which is temperature dependent. A wear transition accompanying the friction transition was not observed. The tests were performed during a research campaign developed in order to investigate the behaviour of some pairs of materials which can be used in a tightness or a bearing function for valves in aerospace applications. [less ▲] Detailed reference viewed: 7 (0 ULg) |
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