Experimental study and modeling of polymer granular structures submitted to internal underpressure

Mariusz Pyrz , Robert Zalewski


The paper deals with a system that consists of a granular material encapsulated in a tight, flexible envelope and submitted to an internal underpressure using a vacuum pump. It is found that the underpressure value has a considerable impact on the behavior and properties of the medium. Experimental studies and modeling of this phenomenon are provided in this work. Results of uniaxial tensile tests carried out on special cylindrical samples and characteristic hardening curves are presented for structures filled up with plastic grains. The nonlinear behavior of these materials is modeled using the viscoplastic constitutive Chaboche law, that requires the determination of several material parameters. The parameters identification problem is formulated as an optimization problem and solved by using an evolutionary algorithm. The numerically simulated graphs follow the experimental curves well. A modified version of Chaboche model, capable of capturing the polymer granular structure response to external loading and including underpressure parameter, is proposed. The presented methodology can be easily adapted to other constitutive models and experiments of special granular structures submitted to internal underpressure.
Author Mariusz Pyrz (FACME / IAE)
Mariusz Pyrz,,
- Institute of Automotive Engineering
, Robert Zalewski (FACME / IMDF)
Robert Zalewski,,
- Institute of Machine Design Fundamentals
Journal seriesMechanics of Materials, ISSN 0167-6636
Issue year2013
Keywords in EnglishGranular material, Underpressure, Viscoplasticity, Experiments, Modeling, Evolutionary algorithm
ASJC Classification2211 Mechanics of Materials; 2500 General Materials Science; 3105 Instrumentation
URL http://www.sciencedirect.com/science/article/pii/S0167663612001962
Languageen angielski
Score (nominal)40
ScoreMinisterial score = 40.0, 10-09-2019, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 10-09-2019, ArticleFromJournal
Publication indicators WoS Citations = 22; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 1.721; WoS Impact Factor: 2013 = 2.225 (2) - 2013=2.575 (5)
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