A Physically-Based Model for Thermo-Oxidative and Hydrolytic Aging of Elastomers

Bahrololoumi, Amir; Mohammadi, Hamid; Moravati, Vahid; Dargazany, Roozbeh

doi:10.1016/j.ijmecsci.2020.106193

Title: A Physically-Based Model for Thermo-Oxidative and Hydrolytic Aging of Elastomers

Journal Article · Tue Nov 17 00:00:00 EST 2020 · International Journal of Mechanical Sciences

DOI:https://doi.org/10.1016/j.ijmecsci.2020.106193· OSTI ID:1848805

Bahrololoumi, Amir ^[1]; Mohammadi, Hamid ^[1]; Moravati, Vahid ^[1]; Dargazany, Roozbeh ^[1]

Michigan State Univ., East Lansing, MI (United States). Dept. of Civil and Environmental Engineering

A computationally efficient model is proposed to capture the loss of mechanical performance due to chemical aging that are formed as the competition of chain scission and cross-link formation/dissolution, such as thermo-oxidative aging or hydrolytic aging. The model should be considered an extension of our recent models [1, 2, 3] which further simplifies the matrix behavior based on the assumption of independence of environmental and mechanical damage. The model uses this assumption to reduce the necessary material parameters needed to model constitutive and inelastic behavior of elastomers during aging. To this end, the model can provide accurate predictions of the material performance with the significantly fewer number of fitting parameters. The model is relevant for all decay mechanisms formed by the occurrence of two simultaneous micro-mechanisms; (i) formation/reduction of the cross-links, and (ii) chain scission, both of which are present in thermo-oxidation and hydrolytic aging. Assuming the alteration of the chain density along the aging trajectory is identical to the peroxide cross-link density for thermo-oxidation, and the change of the average molecular weight for hydrolysis, the strain energy of polymer matrix can be rewritten as a function of deformation, deformation history, storage time and aging temperature. Next, the modified network alteration model is formulated for implementation into Finite Element (FE) simulations. The model is built on the presumption of homogeneous and consistent oxygen/water absorption and thus is mainly relevant for relatively thin samples exposed to environmental loads for a long time. The proposed model includes only six physically inspired material parameters. Therefore, while it is computationally efficient, it shows good agreement with own experimental data, which performed on various range of accelerated aging temperatures and times. With respect to its computational efficiency, simplicity, accuracy, and interpret-ability, the model is the right choice for advanced implementations in FE programs.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0008455

OSTI ID:: 1848805

Alternate ID(s):: OSTI ID: 1775856

Journal Information:: International Journal of Mechanical Sciences, Vol. 194, Issue C; ISSN 0020-7403

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: A Physically-Based Model for Thermo-Oxidative and Hydrolytic Aging of Elastomers

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