Stress relaxation behavior and life prediction of gasket materials used in proton exchange membrane fuel cells

Abstract

Silicone rubber gaskets are employed to keep fuel gases and oxidation in their own zones. Due to the viscosity and elasticity, the assembly force could relax when the silicone rubber is compressed in a proton exchange membrane fuel cell. In this work, the stress relaxation behavior of silicone rubber samples is studied under different temperatures and simulated operating conditions. The results show that the stress relaxes exponentially with time at 25% strain level, especially at higher temperature or with higher acid concentration solution. The three-term Prony series can simulate the viscoelastic behavior well, and the Master curves are established by applying a time-temperature superposition method to estimate the life of the samples. It can save approximately 50% and 78% of the test time when an operating temperature and acid solution are chosen appropriately.

Keywords

stress relaxation / gasket / silicone rubber / life prediction / fuel cell

References

[1] JiaY, QiZ, YouH. Power production enhancement with polyaniline composite anode in benthic microbial fuel cells [J]. Journal of Central South University, 2018, 25(3): 499-505

[2] LiuG, E J, LiuT, WeiZ, ZhangQ. Effects of different poses and wind speeds on flow field of dish solar concentrator based on virtual wind tunnel experiment with constant wind [J]. Journal of Central South University, 2018, 25(8): 1948-1957

[3] CuiT, ChaoY J, ChenX M, van ZeeJ W. Effect of water on life prediction of liquid silicone rubber seals in polymer electrolyte membrane fuel cell [J]. Journal of Power Sources, 2011, 196(22): 9536-9543

[4] CuiT, ChaoY J, van ZeeJ W. Stress relaxation behavior of EPDM seals in polymer electrolyte membrane fuel cell environment [J]. International Journal of Hydrogen Energy, 2012, 37(18): 13478-13483

[5] WanZ, LiangD, LuL, TangY. Fabrication of micro-flow channels on graphite composite bipolar plates using microplanning [J]. Journal of Central South University, 2015, 22(8): 2963-2970

[6] HusarA, SerraM, KunuschC. Description of gasket failure in a 7 cell PEMFC stack [J]. Journal of Power Sources, 2007, 169(1): 85-91

[7] IshikawaH, TeramotoT, UeyamaY, SugawaraY, UchidaM. Use of a sub-gasket and soft gas diffusion layer to mitigate mechanical degradation of a hydrocarbon membrane for polymer electrolyte fuel cells in wet-dry cycling [J]. Journal of Power Sources, 2016, 325: 35-41

[8] SchulzeM, KnÖriT, SchneiderA, GülzowE. Degradation of sealings for PEFC test cells during fuel cell operation [J]. Journal of Power Sources, 2004, 127(12): 222-229

[9] SridharR L, KrishnanR. PEMFC membrane electrode assembly degradation study based on its mechanical properties [J]. International Journal of Materials Research, 2013, 104(9): 892-898

[10] LiG, TanJ Z, GongJ M. Chemical aging of the silicone rubber in a simulated and three accelerated proton exchange membrane fuel cell environments [J]. Journal of Power Sources, 2012, 217: 175-183

[11] LiG, TanJ Z, GongJ M. Degradation of the elastomeric gasket material in a simulated and four accelerated proton exchange membrane fuel cell environments [J]. Journal of Power Sources, 2012, 217: 244-251

[12] LiG, TanJ Z, GongJ M, JiaW H. Degradation mechanism of the silicone rubber in simulated PEM fuel cell environments [J]. Journal of Chemical Industry and Engineering (China), 2014, 65(9): 3669-3675(in Chinese)

[13] RajagopalK R. A note on novel generalizations of the Maxwell fluid model [J]. International Journal of Non-Linear Mechanics, 2012, 47(1): 72-76

[14] ZhouL Q, MeleshkoS V. Group analysis of integro-differential equations describing stress relaxation behavior of one-dimensional viscoelastic materials [J]. International Journal of Non-Linear Mechanics, 2015, 77: 223-231

[15] KontouE, SpathisG, GeorgiopoulosP. Modeling of nonlinear viscoelasticity-viscoplasticity of bio-based polymer composites [J]. Polymer Degradation and Stability, 2014, 110: 203-207

[16] da RochaE B D, LinharesF N, GabrielC F S, de SousaA M F, FurtadoC R G. Stress relaxation of nitrile rubber composites filled with a hybrid metakaolin/carbon black filler under tensile and compressive forces [J]. Applied Clay Science, 2018, 151: 181-188

[17] ZengQ, ZhaoX. Time-dependent testing evaluation and modeling for rubber stopper seal performance [J]. PDA Journal of Pharmaceutical Science and Technology, 2018, 72: 134-148

[18] MazeranP E, BeyaouiM, BigerelleM, GuigonM. Determination of mechanical properties by nanoindentation in the case of viscous materials [J]. International Journal of Materials Research, 2012, 103(6): 715-722

[19] CaiW, ChenW, XuW. Characterizing the creep of viscoelastic materials by fractal derivative models [J]. International Journal of Non-Linear Mechanics, 2016, 87: 58-63

[20] MengL, WuM. Study on stress relaxation of membrane structures in the prestress state by considering viscoelastic properties of coated fabric [J]. Thin Walled Structure, 2016, 106: 18-27

[21] ReyT, ChagnonG, Le camJ B, FavierD. Influence of the temperature on the mechanical behaviour of filled and unfilled silicone rubbers [J]. Polymer Test, 2013, 32(3): 492-501

[22] YamaguchiK, ThomasA G, BusfieldJ J C. Stress relaxation, creep and set recovery of elastomers [J]. International Journal of Non-Linear Mechanics, 2015, 68: 66-70

[23] ShiC, CaoC, LeiM, PengL, ShenJ. Time-dependent performance and constitutive model of EPDM rubber gasket used for tunnel segment joints [J]. Tunnelling and Underground Space Technology, 2015, 50: 490-498

[24] KömmlingA, JaunichM, WolffD. Effects of heterogeneous aging in compressed HNBR and EPDM O-ring seals [J]. Polymer Degradation and Stability, 2016, 126: 39-46

[25] VaidyanathanT K, VaidyanathanJ. Validity of predictive models of stress relaxation in selected dental polymers [J]. Dental Materials, 2015, 31(7): 799-806

[26] YoonS, SiviourC R. Application of the Virtual Fields Method to a relaxation behaviour of rubbers [J]. Journal of the Mechanics and Physics of Solids, 2018, 116: 416-431

[27] LorenzB, Pyckhout-hintzenW, Persson b nJ. Master curve of viscoelastic solid: Using causality to determine the optimal shifting procedure, and to test the accuracy of measured data [J]. Polymer, 2014, 55(2): 565-571

[28] AschenbrennerM, KulozikU, FoerstP. Evaluation of the relevance of the glassy state as stability criterion for freeze-dried bacteria by application of the Arrhenius and WLF model [J]. Cryobiology, 2012, 65(3): 308-318

[29] BriodyC, DuignanB, JerramsS, RonanS. Prediction of compressive creep behaviour in flexible polyurethane foam over long time scales and at elevated temperatures [J]. Polymer Test, 2012, 31(8): 1019-1025

[30] BriodyC, DuignanB, JerramsS, TiernanJ. The implementation of a visco-hyperelastic numerical material model for simulating the behaviour of polymer foam materials [J]. Computational Materials Science, 2012, 64: 47-51

[31] MariaH J, LyczkoN, NzihouA, JosephK, MathewC, ThomasS. Stress relaxation behavior of organically modified montmorillonite filled natural rubber/nitrile rubber nanocomposites [J]. Applied Clay Science, 2014, 87: 120-128

[32] SclarskyE, KadlowecJ, VernengoA J. Modeling stress relaxation of crosslinked polymer networks for biomaterials applications: A distance learning module [J]. Education for Chemical Engineers, 2016, 17: 14-20