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A multi-physics constitutive model to predict hydrolytic aging in quasi-static behaviour of thin cross-linked polymers

Journal Article · · International Journal of Plasticity
 [1];  [2];  [3];  [2]
  1. Michigan State Univ., East Lansing, MI (United States); OSTI
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Robert Bosch Company, Reutlingen (Germany)
The effect of hydrolytic aging on mechanical quasi-static responses of rubber-like materials, in particular, the idealized Mullins effect and permanent set have been modeled. The effect of hydrolytic damage on the mechanical integrity of the polymer matrix is modeled as the direct competition of two micro-structural phenomena (i) chain scission and (ii) reduction of cross-links. Both phenomena and their correlation were modeled and thus, the strain energy of the polymer matrix is written with respect to three independent mechanisms; i) the shrinking original matrix that has not been attacked by water, ii) conversion of the first network to a new network due to the reduction of the cross-links, and iii) energy loss from network degradation due to water attacks to polymer active agents. The proposed model satisfies the Clausius-Duhem inequality and is thus physically feasible. The model is validated with respect to sets of our experimental data and other sets available in the literature. The proposed model is based on the assumption of homogeneous diffusion and mainly relevant for thin samples. In view of its accuracy, interpret-ability, and deep insight it provides into the nature of damage accumulation, the model is a good choice for further implementation in FE applications.
Research Organization:
Michigan State Univ., East Lansing, MI (United States); Michigan State University, East Lansing, MI (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
Grant/Contract Number:
EE0008455
OSTI ID:
1799512
Alternate ID(s):
OSTI ID: 2328544
OSTI ID: 1616230
Journal Information:
International Journal of Plasticity, Journal Name: International Journal of Plasticity Vol. 130; ISSN 0749-6419
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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