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CHEMO-MECHANICAL MODEL FOR PREDICTING THE LIFETIME OF EPDM RUBBERS

Article dans une revue avec comité de lecture
Auteur
HASSINE, Mouna Ben
NAIT-ABELAZIZ, Moussa
1252 Laboratoire de Mécanique de Lille - FRE 3723 [LML]
ccCOLIN, Xavier
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/18779
DOI
10.5254/rct.19.81469
Date
2019
Journal
Rubber Chemistry and Technology

Résumé

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 “chemical level” calculates the degradation kinetics of the macromolecular network that is introduced into the “mechanical level” to deduce the corresponding mechanical behavior in tension. The “chemical level” is derived from a realistic mechanistic scheme composed of 19 elementary reactions describing the thermal oxidation of EPDM chains, their stabilization against oxidation by commercial antioxidants but also by sulfide bridges, and the maturation and reversion of the macromolecular network. The different rate constants and chemical yields have been determined from a heavy thermal aging campaign in air between 70 and 170 °C on four distinct EPDM formulations: additive free gum, unstabilized and stabilized sulfur vulcanized gum, and industrial material. This “chemical level” has been used as an inverse resolution method for simulating accurately the consequences of thermal aging at the molecular (concentration changes in antioxidants, carbonyl products, double bonds, and sulfide bridges), macromolecular (concentration changes in chain scissions and cross-link nodes), and macroscopic scales (weight changes). Finally, it gives access to the concentration changes in elastically active chains from which are deduced the corresponding changes in average molar mass MC between two consecutive cross-link nodes. The “mechanical level” is derived from a modified version of the statistical theory of rubber elasticity, called the phantom network theory. It relates the elastic and fracture properties to MC if considering the macromolecular network perfect, and gives access to the lifetime of the EPDM rubber based on a relevant structural or mechanical end-of-life criterion. A few examples of simulations are given to demonstrate the reliability of the chemo-mechanical model.

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  • Laboratoire de Mécanique des Fluides de Lille (LMFL)
  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • Time to failure prediction in rubber components subjected to thermal ageing: A combined approach based upon the intrinsic defect concept and the fracture mechanics 
    Article dans une revue avec comité de lecture
    BEN HASSINE, Mouna; NAÏT-ABDELAZIZ, M; ZAÏRI, F; TOURCHER, C; MARQUE, Gregory; ccCOLIN, Xavier (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 ...
  • A unified mechanical based approach to fracture properties estimates of rubbers subjected to aging 
    Article dans une revue avec comité de lecture
    KADRI, Réda; NAIT ABDELAZIZ, Moussa; BEN HASSINE, Moussa; WITZ, Jean-François; ccFAYOLLE, Bruno (Elsevier BV, 2021)
    In this work, the influence of aging on the mechanical properties at break of rubber materials are examined. When subjected to physical-chemical aging, the structure of the rubber network is deeply modified through two ...
  • Micromechanical based model for predicting aged rubber fracture properties 
    Article dans une revue avec comité de lecture
    KADRI, R; ccNAIT ABDELAZIZ, Moussa; ccFAYOLLE, Bruno; AYOUB, G.; BEN HASSINE, M.; NZIAKOU, Y. (2023)
    Environmental aging induces a slow and irreversible alteration of the rubber material’s macromolecular network. This alteration is triggered by two mechanisms which act at the microscale: crosslinking and chain scission. ...
  • New developments in fracture of rubbers: Predictive tools and influence of thermal aging 
    Article dans une revue avec comité de lecture
    NAÏT-ABDELAZIZ, Moussa; AYOUB, Georges; BENHASSINE, M.; MOUWAKEH, M.; ccCOLIN, Xavier (Elsevier, 2019)
    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 ...
  • Experimental investigation and modeling attempt on the effects of ultraviolet aging on the fatigue behavior of an LDPE semi-crystalline polymer 
    Article dans une revue avec comité de lecture
    LAMNII, H.; NAIT-ABELAZIZ, Moussa; AYOUB, Georges; MASCHKE, U.; ccCOLIN, Xavier (Elsevier, 2021)
    The objective of this study was to investigate the effect of UV irradiation on the fatigue life of a bulk semi-crystalline polymer. Low-density polyethylene samples exposed to different UV irradiation doses were fatigue ...

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