Publication detail

Local experimental determination of material characteristics for polymers related to fem analysis

DOBEŠ, M. VRBKA, J.

Original Title

Local experimental determination of material characteristics for polymers related to fem analysis

Type

journal article - other

Language

English

Original Abstract

Polymer materials exhibit a high ductility. Determination of the yield strain as well as the break (ultimate) strain is usually done on the basis of tensile tests performed on standard samples and evaluated for normalized measured length, supposing the homogeneous material deformation along the sample axis. This experimental approach does not take into account the plastic strain concentration in small neck area during the final deformation phase before the sample rupture, what is typical for the plastics behavior. Application of so defined material characteristic in the case of Finite element method (FEM) analyses of real constructions made of TSCP plastics (typical semi-crystal polymer) led to significantly conservative (smaller) values of ultimate loads compared to the measured ones. 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 being also in correlation with the FEM element size. Application of the more realistic (higher local) break strain value in the case of FEM analyses of real TSCP constructions led to much better agreement between the calculated and measured stiffness and ultimate load values.

Keywords

polymer, experiment, break limit, FEM analysis, high-speed camera

Key words in English

polymer, experiment, break limit, FEM analysis, high-speed camera

Authors

DOBEŠ, M.; VRBKA, J.

RIV year

2014

Released

25. 2. 2014

Publisher

Association for Engineering Mechanics

Location

Praha

ISBN

1802-1484

Periodical

Engineering Mechanics

Year of study

21

Number

3

State

Czech Republic

Pages from

151

Pages to

158

Pages count

8

BibTex

@article{BUT108956,
  author="Martin {Dobeš} and Jan {Vrbka}",
  title="Local experimental determination of material characteristics for polymers related to fem analysis",
  journal="Engineering Mechanics",
  year="2014",
  volume="21",
  number="3",
  pages="151--158",
  issn="1802-1484"
}