A lattice discrete element method to model the falling-weight impact test of PMMA specimens

It is introduced in this paper a Lattice Discrete Element Method (LDEM) for modelling the falling- weight test of polymethyl-methacrylate (PMMA) specimens. The method exploits the inherent characteristics of discrete methods to model crack initiation and propagation by simply breaking the links...

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Detalles Bibliográficos
Autores principales: Kosteski, Luis Eduardo, Iturrióz, Ignacio, Cisilino, Adrián Pablo, Barrios D’Ambra, Ricardo José Luis, Pettarin, Valeria, Fasce, Laura, Frontini, Patricia
Formato: Artículo
Lenguaje:Inglés
Publicado: Elsevier 2021
Materias:
Impact test
Impact of polymers
Lattice discrete element methods
Abaqus
Explicit
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/28423
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
Descripción
Sumario:It is introduced in this paper a Lattice Discrete Element Method (LDEM) for modelling the falling- weight test of polymethyl-methacrylate (PMMA) specimens. The method exploits the inherent characteristics of discrete methods to model crack initiation and propagation by simply breaking the links between their discrete components. It results in a flexible modelling tool that is implemented using Abaqus/Explicit. Numerical results are validated by comparison with experimental tests. The results are compared in terms of the time evolution of the striker force and velocity and the specimen crack patterns. The LDEM simu- lations are, in every case, of predictive nature. Material properties are neither left open for calibration nor used to adjust the numerical results. There is a good agreement between experimental and numer- ical results. It is shown that the proposed LDEM has the capability to capture all the main features of the sequence of events that occur during the experiment: the elastic specimen loading prior to the crack initiation, the nucleation and propagation of radial cracks as the test progresses, and the final failure after the rapid propagation of a circular crack that joins the radial cracks together. The effects of the variabil- ity of the material fracture toughness on the test results are studied using a series of models with random distribution of the fracture energy.

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