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Numerical investigation of wear processes by a gradient-enhanced damage-plasticity model

  • The prediction of failure mechanism in structures are always an important topic in the field of computational mechanics.Finite element computations of an inelastic material involving softening behavior (e.g. softening plasticity or damage) cansuffer from strongly mesh-dependent results. Therefore, such continuum models should be equipped with a regularization(localization limiter) strategy to overcome the above-mentioned problem.In this study, we present a framework for gradient-enhancement for coupled damage-plasticity material model derived bymeans of Hamilton’s principle for non-conservative continua. This model is applied for the numerical investigation of wearprocesses as they occur, e.g. in the case of mechanized tunneling. These investigations require a fine resolution of the involvedconstituents (cut sheet and abrasive particles in the soil). Consequently, a numerical strategy for the damage-plasticity modelis demanded that allows for time-efficient simulations.In this paper, we present a first step to the mentioned ultimate goal. To this end, a numerical framework for gradient-enhanced damage-plasticity coupling is proposed that is based on a combination of the finite element method with strategiesfrom meshless methods. We demonstrate that this framework keeps the computational effort limited and for each load stepclose to the purely elastic problems. Several numerical examples prove the elimination of the pathological mesh dependencyof the results. Furthermore, first results to the simulation of wear in tunneling machines are presented.

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Author:Golnaz HoormazdiORCiDGND, Klaus HacklORCiDGND, Philipp JunkerORCiDGND
Parent Title (English):Proceedings in applied mathematics and mechanics
Publisher:Wiley-VCH Verlag
Place of publication:Weinheim
Document Type:Article
Date of Publication (online):2020/05/19
Date of first Publication:2019/11/18
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Issue:1, Artikel e201900234
First Page:e201900234-1
Last Page:e201900234-2
Dieser Beitrag ist auf Grund des DEAL-Wiley-Vertrages frei zugänglich.
Institutes/Facilities:Lehrstuhl für Mechanik - Materialtheorie
Dewey Decimal Classification:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften, Maschinenbau
open_access (DINI-Set):open_access
Licence (English):License LogoCreative Commons - CC BY 4.0 - Attribution 4.0 International