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Showing 1 to 9 of 9 for “"Prony Series"”.
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Viscoelastic characterization of polyurea based polymers
… relaxation modulus were obtained in the form of Prony series. The thermal shift factor for bulk relaxation was fitted with the Arrhenius equation while for shear relaxation, the trend was fitted with the WLF equation. The nonlinear response at ambient conditions was predicted using the modified …
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Time Domain Integral Equation-Based Methods for Analyzing Electromagnetic Scattering From Objects Residing in Lossy Media
… are proposed in this dissertation, viz., the Prony series-based recursive convolution scheme and the multilevel plane wave time domain (PWTD) algorithm. The former reduces the computational cost to O( N2sNt log Nt). The latter is the extension of the PWTD scheme for free space and is able to …
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Optimal distribution of the relaxation behavior of linear viscoelastic materials by the particle swarm optimization method applied to the problem of a twisting shaft
… of the relaxation behavior (coefficients of the Prony series expansion) across the system was obtained to achieve a target performance of the dynamic system by the particle swarm optimization (PSO) method. The (PSO) method was applied to a simple fixed shaft to demonstrate the improvement in the …
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Comparison of Creep Compliance Master Curve Models for Hot Mix Asphalt
… superposition. Three mathematical functions, Prony series, power and sigmoidal, were fitted to the experimental data using regression analysis. Uniaxial CCMC were also predicted based on dynamic modulus measurements using method for interconversion of vicoelastic properties recommended in the …
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MATERIAL PROPERTIES OF AORTA FROM BIAXIAL OSCILLATORY TESTS
… 0.241 +/- 0.011 ln(P) for pressure in kPa, and a Prony series creep function ( J0 = 0.472 +/- 0.021, J2 = 0.109 +/- 0.060, J3 = 0.419 +/- 0.056). Modeling results were then used to determine the relationships between the circumferential and longitudinal stresses and strains of the material. The …
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Linear and Nonlinear Viscoelastic Characterization of Proton Exchange Membranes and Stress Modeling for Fuel Cell Applications
… to validate the hygrothermal master curve. The Prony series coefficients determined based on the hygrothermal stress relaxation master curves were utilized in a linear viscoelastic stress model. The nonlinear viscoelastic behavior of the membranes was characterized by conducting creep tests on …
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Estimation of Elastic and Damping Characteristics of Viscoelastically Constrained Carbon Strands
Traditional large space structure construction incorporates the use of lightweight tubular metal alloys that have good strength to weight and stiffness to weight ratio. Recently, however, space structure construction has shifted focus on materials that are ultra lightweight, have high strength, …
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Multi-Scale Physics Based Modeling of Tire Rolling Resistance Considering Aging
… model was developed using the Fourier series approach to evaluate the steady-state stress response and energy dissipation for any harmonic and non-harmonic periodic strain signals. Additionally, the dissertation strove to build a continuum damage mathematical model using a combined …