Mullins effect in a filled elastomer under uniaxial tension

Maiti, A.; Small, W.; Gee, R. H.; Weisgraber, T. H.; Chinn, S. C.; Wilson, T. S.; Maxwell, R. S.

doi:10.1103/PhysRevE.89.012602

Title: Mullins effect in a filled elastomer under uniaxial tension

Journal Article · Thu Jan 16 00:00:00 EST 2014 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.89.012602· OSTI ID:1237547

Maiti, A. ^[1]; Small, W. ^[1]; Gee, R. H. ^[1]; Weisgraber, T. H. ^[1]; Chinn, S. C. ^[1]; Wilson, T. S. ^[1]; Maxwell, R. S. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Modulus softening and permanent set in filled polymeric materials due to cyclic loading and unloading, commonly known as the Mullins effect, can have a significant impact on their use as support cushions. The quantitative analysis of such behavior is essential to ensure the effectiveness of such materials in long-term deployment. In this work we combine existing ideas of filler-induced modulus enhancement, strain amplification, and irreversible deformation within a simple non-Gaussian constitutive model to quantitatively interpret recent measurements on a relevant PDMS-based elastomeric cushion. Also, we find that the experimental stress-strain data is consistent with the picture that during stretching (loading) two effects take place simultaneously: (1) the physical constraints (entanglements) initially present in the polymer network get disentangled, thus leading to a gradual decrease in the effective cross-link density, and (2) the effective filler volume fraction gradually decreases with increasing strain due to the irreversible pulling out of an initially occluded volume of the soft polymer domain.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1237547

Report Number(s):: LLNL-JRNL-641518

Journal Information:: Physical Review E, Vol. 89, Issue 1; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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