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Non-contact method used to determine the swelling/shrinking coefficients under CO2 sorption/desorption on an HNBR O-ring - Study of coupling with temperature and pressure

Abstract : To make use of an O-ring under different pressures and temperatures and to procedure predictive numerical simulations of its use, it becomes important to identify the O-ring behavior under coupled CO 2 sorption (i.e. swelling) and desorption (i.e. shrinking) together with the effect of temperature. Therefore, the presented study deals with an experimental non-contact measurement technique to identify the swelling and shrinking coefficients during pressurization and depressurization under carbone dioxide (CO 2) of an HNBR O-ring. In order to ensure the feasibility of CO 2 sorption (or desorption) measurement from the non-contact method, a purely thermal expansion test permits to identify the thermal expansion coefficient of HNBR, which is well known by other methods including a standard. Numerical simulations complete this section. The simulations ensure that the chosen analysis methodology allows direct identification of swelling and shrinking coefficients and thus determine the seal volume change. CO 2 pressurization and CO 2 depressurization tests at pressures (2, 4 and 6 MPa) under isothermal conditions (60 and 130°C) and a coupled temperature-pressure CO 2 tests are conducted. The measurements made during these tests show that the CO 2 swelling and shrinking coefficients are independent of pressure but temperature dependent. Besides, a good measurements reproducibility was observed and the order of magnitude of these coefficients leads to a strain in the same order as the thermal strain.
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https://hal.archives-ouvertes.fr/hal-03092444
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Submitted on : Thursday, January 7, 2021 - 3:32:45 PM
Last modification on : Wednesday, November 3, 2021 - 5:57:21 AM
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Eric Lainé, J.C. Grandidier, G. Benoit, B. Omnès, Séverine A.E. Boyer. Non-contact method used to determine the swelling/shrinking coefficients under CO2 sorption/desorption on an HNBR O-ring - Study of coupling with temperature and pressure. Polymer Testing, Elsevier, 2020, 85, pp.106411. ⟨10.1016/j.polymertesting.2020.106411⟩. ⟨hal-03092444⟩

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