Detail publikace

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

DOBEŠ, M. VRBKA, J.

Český název

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

Anglický název

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

Typ

článek v časopise - ostatní, Jost

Jazyk

en

Originální abstrakt

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.

Český abstrakt

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.

Anglický abstrakt

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.

Klíčová slova česky

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

Klíčová slova anglicky

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

Rok RIV

2014

Vydáno

25.02.2014

Nakladatel

Association for Engineering Mechanics

Místo

Praha

ISSN

1802-1484

Ročník

21

Číslo

3

Strany od–do

151–158

Počet stran

8

BIBTEX


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