Maio 2014 vol. 1 num. 1 - 10th World Congress on Computational Mechanics

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MULLINS'' EFFECT IN SEMICRYSTALLINE POLYMERS: EXPERIMENTS AND MODELINS

Drozdov, A. D. ; Lejre, A.-L. Hog ;

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Observations are reported on isotactic polypropylene in uniaxial tensile cyclic tests with a mixed program (oscillations between maximum strains ²max and the zero min- imum stress ¾min = 0 when ²max increase monotonically with number of cycles n). Ex- perimental data demonstrate fading memory of deformation history: when tensile strain ² exceeds maximum strain at the previous cycle, stress-strain curves become identical for specimens subjected to di®erent loading programs. These observations resemble the Mullins e®ect: the stress-strain diagram under tension for a specimen subjected to cyclic deformation with maximum strain ²max rapidly reaches that for a virgin specimen when strain ² exceeds ²max. The di®erence between our ¯ndings and the Mullins phenomenon is that the stress{strain diagrams coincide not only under loading, but under retraction as well, and the coincidence is observed for arbitrary cyclic deformation programs. A constitutive model is derived in cyclic viscoplasticity of semicrystalline polymers with ¯- nite strains, and adjustable parameters in the stress-strain relations are found by ¯tting observations. Ability of the model to predict the mechanical response of polypropylene in multi-cycle tensile tests and to describe the fading memory phenomenon is con¯rmed by numerical simulation.

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Palavras-chave: Semicrystalline polymers, Finite viscoplasticity, Cyclic deformation, Mullins e®ect, Constitutive modeling.,

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DOI: 10.5151/meceng-wccm2012-16802

Referências bibliográficas
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Como citar:

Drozdov, A. D.; Lejre, A.-L. Hog; "MULLINS'' EFFECT IN SEMICRYSTALLINE POLYMERS: EXPERIMENTS AND MODELINS", p. 438-455 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-16802

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