scholarly journals Adapted measuring sequence for the determination of directional-dependent dynamic material properties using a bending resonance method

2019 ◽  
Vol 79 ◽  
pp. 106044 ◽  
Author(s):  
Martin Dannemann ◽  
Klaudiusz Holeczek ◽  
Jana Leimert ◽  
Stefan Friebe ◽  
Niels Modler
Keyword(s):  
Material Properties ◽  
Resonance Method ◽  
Dynamic Material Properties ◽  
Measuring Sequence

Determination of Charge Coefficient of Piezoelectric Films Using a Combined Finite Element Model and Dynamic Loading Technique

2020 ◽  
Vol 835 ◽  
pp. 229-242
Author(s):  
Oboso P. Bernard ◽  
Nagih M. Shaalan ◽  
Mohab Hossam ◽  
Mohsen A. Hassan
Keyword(s):  
Finite Element ◽  
Dynamic Loading ◽  
Material Properties ◽  
Accurate Determination ◽  
Substrate Material ◽  
Experimental Results ◽  
Piezoelectric Composite ◽  
Piezoelectric Film ◽  
Piezoelectric Charge

Accurate determination of piezoelectric properties such as piezoelectric charge coefficients (d33) is an essential step in the design process of sensors and actuators using piezoelectric effect. In this study, a cost-effective and accurate method based on dynamic loading technique was proposed to determine the piezoelectric charge coefficient d33. Finite element analysis (FEA) model was developed in order to estimate d33 and validate the obtained values with experimental results. The experiment was conducted on a piezoelectric disc with a known d33 value. The effect of measuring boundary conditions, substrate material properties and specimen geometry on measured d33 value were conducted. The experimental results reveal that the determined d33 coefficient by this technique is accurate as it falls within the manufactures tolerance specifications of PZT-5A piezoelectric film d33. Further, obtained simulation results on fibre reinforced and particle reinforced piezoelectric composite were found to be similar to those that have been obtained using more advanced techniques. FE-results showed that the measured d33 coefficients depend on measuring boundary condition, piezoelectric film thickness, and substrate material properties. This method was proved to be suitable for determination of d33 coefficient effectively for piezoelectric samples of any arbitrary geometry without compromising on the accuracy of measured d33.

Determination of size of cobalt on alumina superparamagnetic particles via the ferromagnetic resonance method

1994 ◽  
Vol 129 (2-3) ◽  
pp. 317-321 ◽  
Author(s):  
Stanislav P. Solodovnikov ◽  
Alexander Yu. Vasil'kov ◽  
Andrei Yu. Olenin ◽  
Vladimir A. Sergeev
Keyword(s):  
Ferromagnetic Resonance ◽  
Resonance Method ◽  
Superparamagnetic Particles
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