Preload influence on the dynamic properties of a polyurethane elastomeric foam
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Fecha
2024-07
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Multidisciplinary Digital Publishing Institute (MDPI)
Resumen
Polymeric foams are widely used in engineering applications for vibration attenuation. The foams usually work preloaded and it is known that the dynamic properties and attenuation ability of these polymers depend on the preload. In this paper, experimental characterization of a polyurethane elastomeric foam is performed in a frequency range between 1 and 60 Hz, a temperature range between −60 and 30 °C and a preload range between 2 and 12 N, using a Dynamic Mechanical Analyzer. When going from the minimum to the maximum preload, results show the linear viscoelastic range increases 57%. In the frequency sweeps, the storage modulus increases 58% on average, while the loss factor remains unaffected by preload. Moreover, the glassy transition temperature of the material decreases for greater preloads. From the curve-fitting of a four-parameter fractional derivative model using the experimental data, a seven-parameter mathematical model is developed, reducing the number of parameters needed to describe the influence of frequency and preload on the dynamic properties of the material. Hence, it has been established that the relaxation time, relaxed modulus and unrelaxed modulus depend on the exponential of the squared prestress. In contrast, the fractional parameter does not depend on preload for the range under study.
Palabras clave
Dynamic properties
Fractional model
Frequency
Linear viscoelasticity
Polymeric foam
Preload
Fractional model
Frequency
Linear viscoelasticity
Polymeric foam
Preload
Descripción
Materias
Cita
Cortazar-Noguerol, J., Cortés, F., Sarría, I., & Elejabarrieta, M. J. (2024). Preload Influence on the Dynamic Properties of a Polyurethane Elastomeric Foam. Polymers, 16(13). https://doi.org/10.3390/POLYM16131844