Décollement par fatigue d'un film mince en flexion: une approche variationnelle

Abstract : We study the debonding of a thin film initially bonded at a rigid support and submitted to a cyclic deflexion. By using a principle of least energy, a Dugdale surface energy and an irreversible condition, we build a debonding growth model under cyclic loading in order to model the phenomenon of fatigue. In particular the number of cycles until the total debonding depends on the ratio $ \varepsilon$ between the internal length introduced in the Dugdale energy and the length of the film. When $\varepsilon$ tends to 0, we show that the limit fatigue law is like a Paris law; the debonding growth rate is a function of the potential energy release rate: $\dot{\ell}=f(G)$.
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André Jaubert, Jean-Jacques Marigo. Décollement par fatigue d'un film mince en flexion: une approche variationnelle. 7e colloque national en calcul des structures, CSMA, May 2005, Giens, France. ⟨hal-01813057⟩

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