[Modélisation des endommagements induits par les contacts entre solides]
Les endommagements induits par les contacts répétés entre solides (tels ceux dûs au roulement–glissement ou aux contacts avec petits débattements qui peuvent entraîner des phénomènes de fretting fatigue) sont particulièrement difficiles à modéliser. Les déformations plastiques générées par ces types de chargement sont complexes à évaluer, notamment pour estimer les états mécaniques asymptotiques dans les zones où les endommagements sont susceptibles de se produire. D'autre part, l'amorçage des fissures de fatigue se produit sous chargements multiaxiaux variables. Afin de surmonter ces difficultés, trois algorithmes spécifiques de calculs élastoplastiques sont tout d'abord proposés. Une approche multiaxiale de la fatigue basée sur une modélisation multiéchelle et sur le concept d'adaptation est ensuite utilisée pour prédire les fissurations observées sur les rails et sur des disques de turbines.
Prediction of damage induced by contact between solids (rolling–sliding contact or small oscillatory contacts inducing fretting-fatigue) is still a challenge. Complex plastic flows in the contact region lead to difficult calculations in order to derive the stabilized stress and strain states in the regions where damage occurs. For this purpose, three specific computational algorithms are proposed. The fatigue damage prediction methodology, based on a multiscale approach and on the shakedown assumption, is applicable to multiaxial fatigue conditions. This article proposes a short review of the recently developed methods in this area and discusses a series of examples.
Mots-clés : Endommagement, Fatigue multiaxiale, Fretting, Adaptation, Éléments finis
Ky Dang Van 1
@article{CRMECA_2008__336_1-2_91_0, author = {Ky Dang Van}, title = {Modelling of damage induced by contacts between solids}, journal = {Comptes Rendus. M\'ecanique}, pages = {91--101}, publisher = {Elsevier}, volume = {336}, number = {1-2}, year = {2008}, doi = {10.1016/j.crme.2007.10.018}, language = {en}, }
Ky Dang Van. Modelling of damage induced by contacts between solids. Comptes Rendus. Mécanique, Duality, inverse problems and nonlinear problems in solid mechanics, Volume 336 (2008) no. 1-2, pp. 91-101. doi : 10.1016/j.crme.2007.10.018. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.10.018/
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