New developments in fracture of rubbers: Predictive tools and influence of thermal aging
TypeArticles dans des revues avec comité de lecture
In this work, the influence of thermal oxidative aging on the ultimate mechanical properties of rubbers is investigated. Two new approaches to predict failure properties are proposed. The first one is the stress limiter approach that uses a “damage” parameter allowing determination of the failure stress and strain of an aged material knowing both the mechanical properties and macromolecular network characteristics of an as-received material. The second one is an extension of the energy limiter approach that suggests capturing the drop of the stress at failure by replacing the strain energy density function of an as-received elastomeric material by a function expressed in terms of an energy limiter. The predictive capabilities of these two approaches are validated using experimental results for two elastomeric materials: an EPDM and a polychloroprene (CR), both of which exhibit a largely predominant post-crosslinking (over chain scissions) during aging. Comparison between the predictions and the experimental results in terms of failure stresses and strains under uniaxial tension showed a good agreement. Consequently, these two approaches are promising tools for designing elastomeric parts subjected to thermal oxidative aging.
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Time to failure prediction in rubber components subjected to thermal ageing: A combined approach based upon the intrinsic defect concept and the fracture mechanics BEN HASSINE, Mouna; NAÏT-ABDELAZIZ, M; ZAÏRI, F; COLIN, Xavier; TOURCHER, C; MARQUE, Gregory (Elsevier, 2014)In this contribution, we attempt to derive a tool allowing the prediction of the stretch ratioat failure in rubber components subjected to thermal ageing. To achieve this goal, the mainidea is to combine the fracture ...
COLIN, Xavier; HASSINE, Mouna Ben; NAIT-ABELAZIZ, Moussa (Rubber Division, ACS, 2019)A chemo-mechanical model has been developed for predicting the long-term mechanical behavior of EPDM rubbers in a harsh thermal oxidative environment. Schematically, this model is composed of two complementary levels: The ...
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NAÏT-ALI, Linda K.; BERGERET, Anne; COLIN, Xavier (EDP Sciences, 2011)The rheometer cavity has been used to analyse, in carefully controlled exposure conditions, the macromolecular changes generated by the mechanical recycling of PET during its extrusion. Isothermal ageing tests at 280 °C, ...
Kinetic analysis and modelling of PET macromolecular changes during its mechanical recycling by extrusion NAÏT-ALI, Linda K.; COLIN, Xavier; BERGERET, Anne (ELSEVIER, 2011)The rheometer cavity has been chosen to analyze, in carefully controlled exposure conditions, the PET macromolecular changes generated during its mechanical recycling by extrusion. Isothermal ageing experiments at 280 °C, ...