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International Journal of Forming Processes
1292-7775
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 ARTICLE VOL 5/2-3-4 - 2002  - pp.521-530  - doi:10.3166/ijfp.5.521-530
TITLE
Computational Characterization of Microto Macroscopic Mechanical Behavior and Damage Polymer Containing SecondPhase Particles

ABSTRACT
A simulation has been done for the characterization of blended polymer containing periodically distributed cylindrical rubber particles of different sizes subjected to macroscopically homogeneous deformation. The onset of cavitation is modeled by introducing a small hole in the particle. The results indicate that the relations between the average normal stress and volume change of the particle are cast into a characteristic single line for all cases in the present investigation. The maximum mean stress appears at the front or at the inflection point of the inclination of the shear band, which corresponds to the intersection point of the shear bands. Soft rubber particles promote plastic deformation, which suggests a higher absorption of the energy and a lower maximum value of mean stress in the polymer. The increase of the macroscopic strain ratio promotes plastic deformation in the polymer and macroscopic yielding, whereas the high triaxiality of the macroscopic stress increases the mean stress in the polymer. The effect of heterogeneity of the particles on the maximum mean stress in the polymer is remarkably different depending on the applied strain ratio.


AUTEUR(S)
Yoshihiro TOMITA, Wei LU

KEYWORDS
Blended polymer, homogenization method, glassy polymer, cavitation, finite element method.

LANGUE DE L'ARTICLE
Anglais

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