Publication detail

Experimental determination of polymer material characteristics having regard to the FEM computational analysis

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

2013

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"
}