Simulation thermomécanique du traitement thermique de culasses en aluminiumThermo-mechanical modeling of the heat treatment for aluminum cylinder heads

Auburtin, P.; Morin, Nicolas

doi:10.1016/s1296-2139(03)00050-2

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…The principle of virtual temperatures is applied to discretize the heat conduction equation, equation (1), in terms of the nodal temperatures. This leads to the general finite element formulation of the heat conduction problem:…”

Section: Numerical Implementationmentioning

confidence: 99%

“…The overall aim of the present work is to include the thermo-mechanical modelling of the heat treatment process as part of modelling all the manufacturing stages of cast components to provide initial conditions for the subsequent structural analysis in order to improve the level of knowledge in the design phase. It is well known that these values are essential for the correct evaluation of the subsequent lifetime prediction analysis of the components [1].…”

Section: Introductionmentioning

confidence: 99%

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Thermo-mechanical modelling of aluminium cast parts during solution treatment

Bellini

Hattel

Thorborg

2006

Modelling Simul. Mater. Sci. Eng.

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The increasing interest of the automotive industry in reducing the weight of cars has resulted in increasing replacement of steel with aluminium parts as well as in an optimization of the design of the components, through structural analysis by FE-codes. The design and manufacturing of these components are important for the lifetime and reliability of the final parts. It is common practice to do load analyses in order to evaluate component lifetime and to do design optimization. However, in order to improve these structural analyses it is important to include the full load history of the material including the influence of the casting process and the subsequent solution treatment phase, quenching and artificial ageing. These manufacturing stages can have a high influence on the deformation and development of residual stresses which are important as initial conditions for subsequent load analysis during service.This paper presents a 3D numerical procedure capable of modelling the development of deformations and stresses from the full thermal history starting from mould filling through solidification to cooling and subsequent reheating for solution treatment, quenching and artificial ageing. However, in the present work the focus is on the modelling of the solution treatment only. The mechanical material model is described by a unified creep model to include rate effects and inelastic behaviour. An industrial component is used as an example to present the influence of creep at high temperature and calculated results with regard to deformations are compared with measurements.

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Section: Numerical Implementationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical modelling of aluminium cast parts during solution treatment

Bellini

Hattel

Thorborg

2006

Modelling Simul. Mater. Sci. Eng.

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Numerical simulation of heat transfer during leaf spring industrial quenching process

Slama

Bouhafs

Bessrour

et al. 2018

Mechanics & Industry

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This study is carried out in partnership with the company CAVEO, manufacturer of leaf springs for vehicles. It concerns the development of a numerical model intended to follow the space-time temperature evolution of a leaf during two processing operations: hot cambering and quenching. This leaf is of a parabolic profile, made of EN-51CrV4 steel (AISI-6150). After austenitization, it passes through a cambering operation to confer it the desired deflection and then a quenching operation. This quenching is carried out in an oil bath to achieve better mechanical properties. The prediction of the temperature during quenching involves determining the heat transfer coefficient between the leaf and the oil bath. This coefficient is determined by quenching, under the same conditions as the leaf, using a standard probe of the same steel. The numerical model is based on the resolution of the transient heat equation by considering the heat loss flows towards the heterogeneous environment (ambient air, press contact and quenching oil). The results obtained by this model give the space-time temperature evolution of the leaf from the exit of the heating furnace to the exit of the oil bath. The numerical results are compared to the experimental profiles obtained through thermographic images throughout cambering and quenching operations. These results are consistent with experimental results.

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Prise en compte des contraintes résiduelles de traitement thermique dans la prédiction de la tenue en service des culasses en aluminium

Comte¹,

Nguyen-Tajan²,

Morin³

et al. 2005

Mécanique & Industries

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Cet article porte sur la modélisation des culasses aluminium de moteurs diesel HDI en vue de prédire leur tenue en fatigue polycyclique. Celles-ci, avant d'être frettées, serrées sur le bloc moteur et utilisées en service, subissent un traitement thermique (trempe et revenu) afin d'améliorer leurs propriétés mécaniques. Lors de ce procédé d'importantes contraintes résiduelles sont générées. Leur modélisation est nécessaire pour obtenir des résultats numériques prédictifs. Une première difficulté vient de la modélisation deséchanges thermiques. Pour cela, le choix d'une fonction analytique simple pour le coefficient d'échange H = f (Tparoi), suivi de l'optimisation des différents paramètres, a permis de modéliser les courbes de refroidissement. Une fois l'histoire thermique de la culasse modélisée, un calcul mécaniqueélastoplastique permet de déterminer les contraintes résiduelles. Celles-ci, fortement de traction dans la zoneà risque, sont défavorablesà la tenueà la fatigue polycyclique de la pièce dans le cas de la trempeà l'eau. La prise en compte de l'état résiduel de fin de traitement thermique dans la filière de dimensionnementà la fatigue polycyclique permet alors de caractériser les zonesà risque expérimentalement observées.

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Simulation thermomécanique du traitement thermique de culasses en aluminiumThermo-mechanical modeling of the heat treatment for aluminum cylinder heads

Cited by 5 publications

References 2 publications

Thermo-mechanical modelling of aluminium cast parts during solution treatment

Thermo-mechanical modelling of aluminium cast parts during solution treatment

Numerical simulation of heat transfer during leaf spring industrial quenching process

Prise en compte des contraintes résiduelles de traitement thermique dans la prédiction de la tenue en service des culasses en aluminium

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