Caractérisation et modélisation du comportement à l'endommagement des rotules de suspension automobile : développement d'un outil d'aide à la conception et l'optimisation

Abstract : Car weighting from new guidelines challenges material and design engineering in new automotive applications. For suspension ball joints, products weighting consequences are the increase of thermomechanical loading supported by the parts which ensure car stability and road handling (curves, hard braking, obstacle crossing, etc.). Under such loadings, the damage of ball joints are due to mechanical, thermical and tribological aspects that can occur in the conformal contact interface. Characterization and modelling of such phenomenon under different thermomechanical loading has been particularly studied. Damage tests performed on automotive ball joint made by our industrial partner VT2i led to understand the influence of intense and repeated solicitation on the part degradation. The analysis of the same phenomenon tested on material probe test gives information about its behavior and define convenient application regime for each VT2i customer demand. A damage modelling in suspension ball joint contact interface has been proposed and compared to damage tests performed on real ball joints. This good adequation between experimental and modelling results confirmed the pertinence of the proposed modelling approach which consists in (i) analyzing kinematical behavior under different loadings of suspension ball joints, (ii) identifying the stress field evolution during the driving phases, (iii) evaluating the sliding distance field in the contact interface, and last (iv) evaluating the damage mode contributions to the total degradation of the ball joint. The modelling allowed to develop an assistance tool for optimization and design of new ball stud/ball socket contact and geometries of suspension ball joints, responding to the severe technical specifications of the automotive market for our industrial partner VT2i
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https://hal.univ-lorraine.fr/tel-01980055
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Submitted on : Monday, January 14, 2019 - 10:41:35 AM
Last modification on : Tuesday, May 28, 2019 - 3:40:17 PM

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  • HAL Id : tel-01980055, version 1

Citation

Jean-Charles Watrin. Caractérisation et modélisation du comportement à l'endommagement des rotules de suspension automobile : développement d'un outil d'aide à la conception et l'optimisation. Mécanique [physics.med-ph]. Université de Lorraine, 2018. Français. ⟨NNT : 2018LORR0183⟩. ⟨tel-01980055⟩

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