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DOBEŠ, M. VRBKA, J.
Original Title
Experimental determination of polymer material characteristics having regard to the FEM computational analysis
Type
conference paper
Language
English
Original Abstract
Unfilled polymer materials exhibit a high ductility, which is moreover located in small neck area. Material producers deliver usually the yield strain and break (ultimate) strain values calculated on the basis of material tensile tests for normalized active sample length. Application of so defined material characteristics in the case of Finite Element Method (FEM) analyses of real constructions made of TSCP (typical semi-crystal polymer) led to significantly conservative (smaller) values of limit (ultimate) loads compared with the measured ones. To obtain more precise results the material characteristics used should be in correlation with the size of finite elements. A special experimental method making use of high-speed camera has been developed to determine the strain in defined small area of local strain concentration (neck area) on the specimen during tensile test. The true stress-strain curve till the sample rupture is here calculated and break strain is determined. Application of more realistics (higher) break strain values by the FEM analyses of real TSCP constructions led to the much better agreement between the calculated and measured construction stiffness and limit (ultimate) load.
Keywords
polymer, experiment, stress-strain curve, break strain, FEM analysis
Authors
DOBEŠ, M.; VRBKA, J.
RIV year
2013
Released
16. 5. 2013
Publisher
Institute of Thermomechanics, Academy os Sciences od the Czech Republic, v. v. i., Prague
Location
Praha
ISBN
978-80-87012-46-8
Book
ENGINEERING MECHANICS 2013
Edition
first
Edition number
Pages from
31
Pages to
32
Pages count
2
BibTex
@inproceedings{BUT101094, author="Martin {Dobeš} and Jan {Vrbka}", title="Experimental determination of polymer material characteristics having regard to the FEM computational analysis", booktitle="ENGINEERING MECHANICS 2013", year="2013", series="first", number="2013", pages="31--32", publisher="Institute of Thermomechanics, Academy os Sciences od the Czech Republic, v. v. i., Prague", address="Praha", isbn="978-80-87012-46-8" }