Multiple necking patterns in elasto-plastic rings subjected to rapid radial expansion: the effect of random distributions of geometric imperfections

Marvi Mashhadi, Mohammad; Rodríguez-Martínez, José A.

Publication:
Multiple necking patterns in elasto-plastic rings subjected to rapid radial expansion: the effect of random distributions of geometric imperfections

dc.affiliation.dpto	UC3M. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras	es
dc.affiliation.grupoinv	UC3M. Grupo de Investigación: Dinámica y Fractura de Elementos Estructurales	es
dc.contributor.author	Marvi Mashhadi, Mohammad
dc.contributor.author	Rodríguez-Martínez, José A.
dc.contributor.funder	European Commission	en
dc.date.accessioned	2020-10-27T13:41:45Z
dc.date.available	2022-10-01T23:00:06Z
dc.date.issued	2020-10
dc.description.abstract	In this paper we have investigated, using finite element calculations performed in ABAQUS/Explicit [1], the effect of ab initio geometric imperfections in the development of multiple necking patterns in ductile rings subjected to dynamic expansion. Specifically, we have extended the work of Rodríguez-Martínez et al. [2], who studied the formation of necks in rings with sinusoidal spatial perturbations of predefined amplitude and constant wavelength, by considering specimens with random distributions of perturbations of varying amplitude and wavelength. The idea, which is based on the work of El Maï et al. [3], is to provide an idealized modeling of the surface defects and initial roughness of the rings and explore their effect on the collective behavior and spacing of the necks. The material behavior has been modeled with von Mises plasticity and constant yield stress, and the finite element simulations have been performed for expanding velocities ranging from 10 m/s to 1000 m/s, as in ref. [2]. For each speed, we have performed calculations varying the number of imperfections in the ring from 5 to 150. In order to obtain statistically significant results, for each number of imperfections, the computations have been run with five random distributions of imperfection wavelengths. For a small number of imperfections, the variability in the wavelengths distribution is large, which makes the imperfections play a major role in the necking pattern, largely controlling the spacing and growth rate of the necks. As the number of imperfections increases, the variability in the wavelengths distribution decreases, giving rise to an array of more regularly spaced necks which grow at more similar speed. A key outcome is to show that, for a large number of imperfections, the number of necks formed in the ring comes closer to the number of necks obtained in the absence of ab initio geometric imperfections.	en
dc.description.sponsorship	The research leading to these results has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme. Project PURPOSE, grant agreement 758056.	en
dc.format.extent	17	es
dc.identifier.bibliographicCitation	International Journal of Impact Engineering, 144, Oct. 2020, 103661, 17 pp.	en
dc.identifier.doi	https://doi.org/10.1016/j.ijimpeng.2020.103661
dc.identifier.issn	0734-743X
dc.identifier.issn	1879-3509 (online)
dc.identifier.publicationfirstpage	1	es
dc.identifier.publicationlastpage	17	es
dc.identifier.publicationtitle	INTERNATIONAL JOURNAL OF IMPACT ENGINEERING	en
dc.identifier.publicationvolume	144 (103661)	es
dc.identifier.uri	https://hdl.handle.net/10016/31309
dc.identifier.uxxi	AR/0000026124
dc.language.iso	eng	en
dc.publisher	Elsevier Ltd.	en
dc.relation.projectID	info:eu-repo/grantAgreement/EC/H2020/758056/PURPOSE	en
dc.rights	© 2020 Elsevier Ltd. All rights reserved.	en
dc.rights	This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.	en
dc.rights	Atribución-NoComercial-SinDerivadas 3.0 España	*
dc.rights.accessRights	open access	en
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/es/	*
dc.subject.eciencia	Ingeniería Mecánica	es
dc.subject.other	Ring expansion	en
dc.subject.other	Finite elements	en
dc.subject.other	Multiple necking	en
dc.subject.other	Geometric imperfections	en
dc.subject.other	Inertia	en
dc.subject.other	Stress multiaxiality	en
dc.title	Multiple necking patterns in elasto-plastic rings subjected to rapid radial expansion: the effect of random distributions of geometric imperfections	en
dc.type	research article	*
dc.type.hasVersion	AM	*
dspace.entity.type	Publication