By Kenneth L. Reifsnider PhD, NAE (auth.), Tom Proulx (eds.)
This the 5th quantity of six from the yearly convention of the Society for Experimental Mechanics, 2010, brings jointly 25 chapters on rising strength structures. It offers early findings from experimental and computational investigations together with fabric nation adjustments in Heterogeneous fabrics for power platforms, Characterization of Carbon Nanotube Foam for enhanced fuel garage power, Thermoresponsive Microcapsules for Autonomic Lithium-ion Battery Shutdown, provider lifestyles Prediction of Seal in PEM gas Cells, and Assessing toughness of Elastomeric Seals for gas telephone Applications.
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Extra resources for Experimental Mechanics on Emerging Energy Systems and Materials, Volume 5: Proceedings of the 2010 Annual Conference on Experimental and Applied Mechanics
Figure 3 shows the time dependent Young’s modulus at the three different strain levels. Although not perfect, the three curves are pretty close to each other. 176865 τ3 (Hour) 2500 Young's Modulus (MPa) The Prony series of equation (1) with three exponential terms are selected to fit with the stress relaxation curve at 25% strain. The coefficients in the fitted Prony series are shown in Table 2. From the practical point of view, these results demonstrate that the test data at one strain level can be transferred or applied to another strain level through the Maxwell model of equation (1) or (4).
Therefore, for convenience one strain level in stress relaxation test is sufficient in laboratory for studying the sealing behavior of PEMFC. 1 Compression stress relaxation test results with specimens in DI Water 30 Figure 4 shows the normalized stress relaxation curves at three temperatures, 70 °C, 100 °C, and 120 °C. The tests for 70 °C and 100 °C were ended after about 1600 hours, since the relaxation rate at this time is sufficiently low. 001 %/hr for the case of 100 °C which would introduce no significant additional relaxation.
A Nonlinear Viscoelastic-Viscoplastic Constitutive Model for Ionomer Membranes in Polymer Electrolyte Membrane Fuel Cells(PEMFC), To be submitted, 2009. , An instrument for environmental control of vapor pressure and temperature for tensile creep and other mechanical property measurements, Review of Scientific Instruments, 78, 103904, 2007. , Viscoelastic Response of Nafion. Effects of Temperature and Hydration on Tensile Creep, Macromolecules, 41(24), 9849-62, 2008. , Viscoealstic Properties of Nafion at Elevated Temperature and Humidity, J of Polymer Science:Part B, 47, 11-24, 2009.