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Journal ArticleDOI

Electromechanical Behavior of Form I Uniaxially and Biaxially Stretched PVDF

01 Sep 2005-Ferroelectrics (Taylor & Francis Group)-Vol. 325, Iss: 1, pp 155-164

Abstract: Experiments were carried out on Form I uniaxially and biaxially stretched Polyvinylidene Fluoride (PVDF) samples to characterize their electromechanical response. The piezoelectric constants were measured at different values of superimposed strains or loads and at different values of frequencies of dynamic strains, which were applied in the longitudinal and transverse direction. It was also found through experiments that, the piezoelectric constants of PVDF are affected by the frequency of loading and there seems to be some dependence of the phase difference between the electrical and mechanical response on the superimposed strains. The tests also confirm to some extent, the results obtained by other researchers, that the piezoelectric constants increase in the longitudinal direction with increasing superimposed strains and decrease in the transverse direction for uniaxially stretched PVDF.
Topics: Piezoelectricity (51%), Biaxial tensile test (50%)
References
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Journal ArticleDOI
01 Apr 1999-Ferroelectrics
Abstract: A consistent experimental program has been developed to investigate the mechanical and electrical properties of polyvinylidene fluoride (PVDF). The results of the study indicate that this piezoelectric polymer can be characterized as an orthotropic, thermorheologically simple material with constant piezoelectric strain coefficients over the experimental range of stresses, frequencies and temperatures. The mechanical properties of PVDF are time-dependent and, under certain loading and temperature conditions, can be treated using the principles of linear hereditary viscoelasticity.

147 citations


"Electromechanical Behavior of Form ..." refers background in this paper

  • ...measuring the electric field due to an applied oscillatory strain or stress on a superimposed offset stress [2, 3]....

    [...]

  • ...[3] have done similar tests on uniaxially stretched PVDF and they have reported no nonlinearity within the range of superimposed strains....

    [...]


Book
01 Jan 1962-
Abstract: Fundamentals of electricity and magnetism , Fundamentals of electricity and magnetism , کتابخانه دیجیتالی دانشگاه علوم پزشکی و خدمات درمانی شهید بهشتی

82 citations


Journal ArticleDOI
01 Apr 1970-Physics Today
Abstract: Fundamentals of electricity and magnetism , Fundamentals of electricity and magnetism , کتابخانه دیجیتالی دانشگاه علوم پزشکی و خدمات درمانی شهید بهشتی

79 citations


Journal ArticleDOI
Abstract: A recent report of a series of dichotic listening experiments [Lauter, J. Acoust. Soc. Am. 71, 701–707 (1982)] showed that although individual listeners differ in the ‘‘absolute ear advantage’’ shown for a given sound, there are patterns of ‘‘relative ear advantages’’ that are consistent across listeners. It was suggested that these patterns might provide a means of studying which features of test sounds are important in determining ear advantages. A survey of 12 earlier experiments, including a brief synopsis of procedures, results, and conclusions, followed by reanalysis of individual scores, shows that patterns of relative ear advantages were also present in earlier results, though obscured by an analysis that focused on the average listener. Examination of these patterns and the characteristics of sounds tested reveals a few acoustical features of sounds (e.g., event timing, bandwidth, number of dimensions changing with time) that seem to affect ear differences in a consistent way, from listener to li...

32 citations


Journal ArticleDOI
Abstract: The effects of hydrostatic pressure and pressure cycling on the piezoelectric properties of polyvinylidene fluoride (PVF2) have been experimentally investigated by using an acoustic reciprocity technique. The hydrostatic piezoelectric constants and the relative dielectric constant were measured as a function of pressure and pressure cycling for both voided and nonvoided PVF2 samples. The dynamic response of these materials to high‐amplitude pressure pulses having a rise time of 1–3 ms was also determined. The results showed that the microvoid structures in PVF2 improve the material’s piezoelectric properties but at the same time increase its pressure dependence and introduce a hysteresis effect with changing hydrostatic pressure. Nonvoided PVF2 films were also shown to have a good dynamic response to pressure pulses and, therefore, are promising for applications such as underwater shock sensors.

18 citations


"Electromechanical Behavior of Form ..." refers background in this paper

  • ...[9] have shown that the hydrostatic piezoelectric constant (d31+ d32+ d33) changes with hydrostatic pressure....

    [...]

  • ...Ting [9] have experimentally determined the hydrostatic piezoelectric constant as a function of pressure and pressure cycling for both voided and nonvoided PVDF samples....

    [...]