Ultrasonic study of elastic creep in piezoceramics

Ultrasonic method and experimental setup for study the elastic creep of piezoelectric materials are described. The results of experimental studies of time behavior of the Young's modulus and the internal friction are presented as well as the longitudinal and transversal piezomoduli and the elec...

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Bibliographic Details
Published inUltrasonics Vol. 81; pp. 140 - 146
Main Authors Tsaplev, V.M., Konovalov, R.S.
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.11.2017
Subjects
Activation energy
Creep
Elastic modulus
Nonlinear properties
Piezoceramics
Relaxation time
Uniaxial stress
Elastic modulus
Creep
Uniaxial stress
Nonlinear properties
Activation energy
Relaxation time
Piezoceramics
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Summary:Ultrasonic method and experimental setup for study the elastic creep of piezoelectric materials are described. The results of experimental studies of time behavior of the Young's modulus and the internal friction are presented as well as the longitudinal and transversal piezomoduli and the electromechanical coupling factor. Four compositions of piezoelectric ceramics both soft and hard, based on BaTiO3 and PZT, were compressed for a long time (0÷107s) by significant static loads (0÷120MPa). The possible physical mechanisms that cause the creep are briefly considered. The concept of a spectrum of activation energies of the corresponding processes is introduced. The upper and the lower boundaries of the relaxation times spectrum were measured and corresponding activation energies were found.
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ISSN:0041-624X
1874-9968
DOI:10.1016/j.ultras.2017.06.024