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Article Dans Une Revue Comptes Rendus. Physique Année : 2021

Analysis of the delayed damage model for three one-dimensional loading scenarii

Analyse du modèle d’endommagement à effet retardpour trois scenarii de chargement mono-dimensionnel

Résumé

The delayed damage model has been introduced by Allix and Deü [1] as a way to overcome spuriousmesh dependency in failure analysis involving damage and dynamic loading. The damage rate is boundedthrough a time scale which, combined with the wave speed, introduces implicitly a length scale. In this paper,the delayed damage model is analyzed through numerical experiments on three different loading cases of abar: a slow loading leading to a dynamic failure, pulses and impact. We observe and discuss the load levelneeded for failure (and the dependence of this load level with respect to the loading rate), as well as thedissipation and extent of the fully damaged zone at failure. Observations lead to the following conclusions.First, the delayed damage model has no regularization effect for a dynamic failure initiating from rest. Second,for pulse loadings, the loading rate has no influence on the minimal load level needed for failure (even thoughthe delayed damage model is a time-dependent model), and beyond this minimal load level for failure, theextent of the fully damage zone rises, proportionally to the length scale. Third, regarding the impact, thevelocity needed to reach failure depends only the time-independent parameters of the models, and not theones linked to the delayed damage.

Dates et versions

hal-03140788 , version 1 (13-02-2021)

Identifiants

Citer

Jihed Zghal, Nicolas Moes. Analysis of the delayed damage model for three one-dimensional loading scenarii. Comptes Rendus. Physique, 2021, 21 (6), pp.527-537. ⟨10.5802/crphys.42⟩. ⟨hal-03140788⟩
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