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  • 11
    Electronic Resource
    Electronic Resource
    One dimensional polar responses of the electrooptic ceramic PLZT 7/65/35 due to domain switching (1981)
    Springer
    Acta mechanica 41 (1981), S. 255-264 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Die Werkstoffgleichungen und Geschwindigkeitsgesetze wie von Chen und Peercy in [1] vorgestellt, wurden erfolgreich zur Beschreibung der eindimensionalen, polaren mechanischen und dielektrischen Reaktionen der elektrooptischen Keramik PLZT 7/65/35 in einem langsam veränderlichen, zyklischen elektrischen Feld eingesetzt. Insbesondere wurden die Wirkungen der Bereichsumschaltung untersucht und die mit den Schmetterlings- und Hystereseschliefen verbundenen Ergebnisse berechnet. Die Übereinstimmung zwischen den numerischen und den experimentellen Ergebnissen ist zufriedenstellend.
    Notes: Summary The constitutive relations and rate laws proposed by Chen and Peercy [1] have been successfully implemented in describing the one dimensional polar mechanical and dielectric responses of the electrooptic ceramic PLZT 7/65/35 to a slowly varying cyclic electric field. In particular, we examine the consequences of domain switching and determine the results associated with the butterfly and hysteresis loops. The agreement between the numerical and the experimental results is quite good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01177351
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  • 12
    Electronic Resource
    Electronic Resource
    Certain characteristics of electrically excitable mechanical resonances in PZT 65/35 (1984)
    Springer
    Acta mechanica 51 (1984), S. 217-226 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this paper, we examine certain characteristics of two electrically excitable mechanical resonances exhibited by two different specimens of the ferroelectric ceramic PZT 65/35. In particular, we determine the phase angle between the charge and the driving voltage, the current in the circuit, the amplitude of the mechanical displacement, and the electrical power dissipated in driving the specimens at each of these resonances for increasing amplitude of the driving voltage. It is shown that the phase angle, the current and the power dissipated have similar characteristics for the two resonances; but their mechanical displacements have entirely disparate features. In one case the amplitude increases more than linearly with respect to the driving voltage, whereas the contrary is true in the other case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01177073
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  • 13
    Electronic Resource
    Electronic Resource
    Characterization of the three dimensional properties of poled PZT 65/35 in the absence of losses (1983)
    Springer
    Acta mechanica 47 (1983), S. 95-106 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this paper we characterize the isothermal three dimensional properties of a poled ferroelectric ceramic PZT 65/35 in the absence of losses. The resulting constitutive relations, in the absence of mechanical dissipation, domain switching, dipole dynamics and phase transformation, are the standard ones which appear in the literature. The characterization of the constitutive relations requires the determination of five elastic constants, three piezoelectric constants and two dielectric constants. We dientify the experimental measurements which are sufficient to determine these constants and describe the data reduction procedures. Our results differ relatively and absolutely from those given in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01176504
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  • 14
    Electronic Resource
    Electronic Resource
    Stabilization criteria for thermally explosive materials (1984)
    Springer
    Acta mechanica 53 (1984), S. 73-79 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A previously obtained condition on the boundary temperature for the existence of a unique steady state solution of the zeroth order Arrhenius reaction equation is shown to be sufficient to guarantee decay of the temperature in the corresponding transient problem. For the heat equation we obtain a bound on the size of the initial data. The bound depends upon domain size and geometry, which may be used to ascertain when disturbances decay to zero in time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01176251
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  • 15
    Electronic Resource
    Electronic Resource
    A theory of the influences of space-charge field on domain switching in PLZT 7/65/35 ceramic (1982)
    Springer
    Acta mechanica 43 (1982), S. 61-72 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this paper we propose a phenomenological theory to explain the influences of a stored space-charge field on domain switching in the electrooptic ceramic PLZT 7/65/35, and show that the resulting numerical predictions of the strain versus electric field curve (butterfly loop) and the electric displacement versus electric field curve (hysteresis loop) are in qualitative agreement with those obtained experimentally. In particular, the stored space-charge field can prohibit as much as 50% of the dipoles from switching in any direction via the application of an external electric field alone; it can also prohibit some of the remaining dipoles from being aligned in the direction opposite to it. We believe that these are the first quantitative results in this regard.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01175816
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  • 16
    Electronic Resource
    Electronic Resource
    Three dimensional constitutive relations for ferroelectric materials in the presence of quasi-static domain switching (1983)
    Springer
    Acta mechanica 48 (1983), S. 31-42 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary We propose, in this paper, three dimensional constitutive relations for the stress and the electric displacement for ferroelectric materials taking into account the changing material properties which occur during quasi-static domain switching. These constitutive relations are characterized for the ceramic PZT 65/35 via experimental results entailing acoustic, electromechanical and electrical measurements. We also establish the correspondence of these constitutive relations to the standard relations in the literature which describes the responses of poled ferroelectric materials in the absence of domain switching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178494
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  • 17
    Electronic Resource
    Electronic Resource
    Noise analysis of refractive index profile measurements of an optical fibre and preform by deflection function techniques (1984)
    Springer
    Flow, turbulence and combustion 41 (1984), S. 289-300 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract It is shown that many of the existing index profiling methods for optical fibre and preform are related to one another through the deflection function from which the index profile is reconstructed. These methods are classified into direct deflection function measurement, integral (or phase) measurement, and differential (or intensity) measurement. The deflection function from the integral method is obtained by measuring the phase distribution of the exit rays followed by numerical differentiation. Thus the reconstructed index profile has Gaussian noise. The deflection function from the differential method is obtained by measuring the light intensity distribution followed by a numerical integration. This process enhances low frequency noise but suppresses high frequency noise. The noise from direct method behaves in the similar manner as in the differential method except that it is less pronounced. Studies of the choice of methods for profiling of preform, multimode fibre and single mode fibre are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00382461
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  • 18
    Electronic Resource
    Electronic Resource
    Continuous measurement of material damping during fatigue tests (1984)
    Springer
    Experimental mechanics 24 (1984), S. 342-348 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An experimental procedure for continuously measuring strain level, temperature, and energy-dissipation rate during resonant fatigue tests is described. The technique is based on a previous method for measuring loss factor (Ref. 3) using base-excited cantilever-beam specimens vibrating at resonance. The amplitude and frequency dependence of loss factor is therefore included directly in the measurement. For beams vibrating in vacuum, energy-dissipation rate and temperature measurements provide a basis for irreversible thermodynamic analysis of fatigue. This procedure provides a continuous measurement of energy-dissipation rate during fatigue-crack nucleation, and is the basis for experimental study of the hypothesis that the entropy gained during fatigue failure is a material constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02323995
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