Comptes Rendus
Static and dynamic behaviour of nonlocal elastic bar using integral strain-based and peridynamic models
Comptes Rendus. Mécanique, Volume 346 (2018) no. 4, pp. 320-335.

The static and dynamic behaviour of a nonlocal bar of finite length is studied in this paper. The nonlocal integral models considered in this paper are strain-based and relative displacement-based nonlocal models; the latter one is also labelled as a peridynamic model. For infinite media, and for sufficiently smooth displacement fields, both integral nonlocal models can be equivalent, assuming some kernel correspondence rules. For infinite media (or finite media with extended reflection rules), it is also shown that Eringen's differential model can be reformulated into a consistent strain-based integral nonlocal model with exponential kernel, or into a relative displacement-based integral nonlocal model with a modified exponential kernel. A finite bar in uniform tension is considered as a paradigmatic static case. The strain-based nonlocal behaviour of this bar in tension is analyzed for different kernels available in the literature. It is shown that the kernel has to fulfil some normalization and end compatibility conditions in order to preserve the uniform strain field associated with this homogeneous stress state. Such a kernel can be built by combining a local and a nonlocal strain measure with compatible boundary conditions, or by extending the domain outside its finite size while preserving some kinematic compatibility conditions. The same results are shown for the nonlocal peridynamic bar where a homogeneous strain field is also analytically obtained in the elastic bar for consistent compatible kinematic boundary conditions at the vicinity of the end conditions. The results are extended to the vibration of a fixed–fixed finite bar where the natural frequencies are calculated for both the strain-based and the peridynamic models.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crme.2017.12.014
Mots-clés : Nonlocal mechanics, Continuum mechanics, Peridynamic models, Integro-differential equation, Functional equation, Scale effects

Noël Challamel 1

1 Université de Bretagne Sud, EA 4250, Institut de recherche Dupuy-de-Lôme, Centre de recherche, rue de Saint-Maudé, BP 92116, 56100 Lorient, France
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Noël Challamel. Static and dynamic behaviour of nonlocal elastic bar using integral strain-based and peridynamic models. Comptes Rendus. Mécanique, Volume 346 (2018) no. 4, pp. 320-335. doi : 10.1016/j.crme.2017.12.014. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2017.12.014/

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