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DOBEŠ, M. VRBKA, J.
Originální název
Local experimental determination of material characteristics for polymers related to fem analysis
Typ
článek v časopise - ostatní, Jost
Jazyk
angličtina
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.
Klíčová slova
polymer, experiment, break limit, FEM analysis, high-speed camera
Klíčová slova v angličtině
Autoři
DOBEŠ, M.; VRBKA, J.
Rok RIV
2014
Vydáno
25. 2. 2014
Nakladatel
Association for Engineering Mechanics
Místo
Praha
ISSN
1802-1484
Periodikum
Engineering Mechanics
Ročník
21
Číslo
3
Stát
Česká republika
Strany od
151
Strany do
158
Strany počet
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" }