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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
  • [1] Cantournet, S., Desmorat, R., Besson, J., \Mullins e®ect and cyclic stress softening of ¯lled elastomers by internal sliding and friction thermodynamics model". Int. J. Solids Struct. 46, 2255-2264, 2009.
  • [2] Chagnon, G., Verron, E., Marckmann, G., Gornet, L., \Development of new con- stitutive equations for the Mullins e®ect in rubber using the network alteration theory". Int. J. Solids Struct. 43, 6817-6831, 2006.
  • [3] Diani, J., Fayolle, B., Gilormini, P., \A review on the Mullins e®ect". Eur. Polym. J. 45, 601-612, 2009.
  • [4] Drozdov, A. D., \Mullins'' e®ect in semicrystalline polymers". Int. J. Solids Struct. 46, 3336-3345, 2009.
  • [5] Drozdov, A. D., \Cyclic strengthening of polypropylene under strain-controlled load- ing". Mater. Sci. Eng. A 528, 8781-8789, 2011.
  • [6] Drozdov, A. D., Christiansen, J. deC., \Mullins'' e®ect in semicrystalline polymers: experiments and modeling". Meccanica 46, 359-370, 2011.
  • [7] Goktepe, S., Miehe, C., \A micro-macro approach to rubber-like materials. Part III: The micro-sphere model of anisotropic Mullins-type damage". J. Mech. Phys. Solids 53, 2259-2283, 2005.
  • [8] Itskov, M., Ehret, A. E., Kazakeviciute-Makovska, R., Weinhold, G. W., \A thermo- dynamically consistent phenomenological model of the anisotropic Mullins e®ect". ZAMM 90, 370-386, 2010.
  • [9] Qi, H. J., Boyce, M. C., \Constitutive model for stretch-induced softening of the stress-stretch behavior of elastomeric materials". J. Mech. Phys. Solids 52, 2187- 2205, 2004.
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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