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Chapitre D'ouvrage Année : 2024

A Full Experimental Characterization of Aged Nitrile Butadiene Rubbers (NBR)

Jean-Benoit Le Cam
Eric Robin
Mathieu Miroir
Jean-Charles Fralin
  • Fonction : Auteur

Résumé

Part of the sealing function in the pneumatic system of the French high-speed train (TGV) is provided by elastomeric components, such as nitrile butadiene rubber (NBR) O-rings. Like most elastomers, NBRs are sensitive to thermo-oxidative aging. In the current application, aging results in a strong hardening of the O-rings, which alters the sealing function and impacts the lifetime of the mechanical pneumatic system. Therefore, understanding the origin of this aging, studying its effects on the mechanical properties, and modeling it are of a paramount importance in optimizing time in maintenance operations of the TGV. In a previous study, accelerated aging tests have been carried out with different NBR formulations at different times and temperatures. These tests enabled us to reproduce ex situ the hardening observed on the O-rings. Aging mechanisms have been identified and related to the aging conditions of the NBR formulations through different characterization techniques: infrared spectroscopy, swelling tests, X-ray fluorescence spectrometry, differential scanning calorimetry thermogravimetric analysis, and micro-hardness. To consider the effects of the mechanical loading on the aging process and the mechanical behavior of tested NBRs, mechanical spectroscopy (DMA) analyses have been carried out. The results obtained highlight how mechanical loadings impact the aging of these NBRs and quantify the effects of aging on their viscoelasticity. From the collected data, a hyperelastic model has finally been identified to simulate the behavior of O-rings by the finite element method. These first results lay the foundation of a selection methodology for O-rings used in the pneumatic system of the TGV.
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Dates et versions

hal-04506191 , version 1 (15-03-2024)

Identifiants

Citer

Adrien Redon, Jean-Benoit Le Cam, Eric Robin, Mathieu Miroir, Jean-Charles Fralin. A Full Experimental Characterization of Aged Nitrile Butadiene Rubbers (NBR). Springer Nature. Conference proceedings of the Society for Experimental Mechanics, pp.91-96, 2024, ⟨10.1007/978-3-031-50470-9_13⟩. ⟨hal-04506191⟩
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