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On the material properties and constitutive equations of piezoelectric poly vinylidene fluoride (PVDF)
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http://hdl.handle.net/1860/86
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| Title: | On the material properties and constitutive equations of piezoelectric poly vinylidene fluoride (PVDF) |
| Authors: | Thompson, Mitchell L. |
| Keywords: | Piezoelectric materials
Polymers -- Mechanical properties
Materials engineering |
| Issue Date: | 7-Nov-2002 |
| Publisher: | Drexel University |
| Abstract: | The complex elastic and piezoelectric material properties of uniaxially orientedPVDF were measured over a temperature range of 20°C to 80°C and a frequency range of0.01 Hz to 100 Hz using specially developed equipment. A WLF Time-TemperatureSuperposition (TTS) expansion of the resulting data confirmed previously reportedthermorheologically simple (TRS) behavior for the elastic properties and established thatthe piezoelectric behavior is also TRS. The form of the piezoelectric TTS expansion wasidentical to that of the elastic expansion, implying that the mechanisms responsible forviscoelastic behavior are also responsible for visco-piezoelectric behavior. A modifiedArrhenius equation was developed to allow a broader TTS expansion. Empiricalequations describing both viscoelastic and piezoelectric properties over temperature andfrequency were constructed using these expansions and compared to measured data.The dielectric properties of PVDF were measured over the range of -60°C to 80°Cand from 20 Hz to 1MHz. Cole-Cole and Vogel-Fulcher equations were combined andthe resulting dielectric equations were confirmed by comparison to measured data.All material property relationships were assembled into a constitutive frameworkfor piezoelectric materials in the frequency domain. A novel technique was employed totest the ability of the elastic, piezoelectric, and dielectric property equations to predictbehavior outside of the measured temperature/frequency range with excellent results. |
| URI: | http://dspace.library.drexel.edu/handle/1860/86 |
| Appears in Collections: | Drexel Theses and Dissertations
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