A study of materials at high temperature using miniaturized resonant tuning forks and noncontact capacitance transducers
UNSPECIFIED. (1997) A study of materials at high temperature using miniaturized resonant tuning forks and noncontact capacitance transducers. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 102 (3). pp. 1296-1309. ISSN 0001-4966Full text not available from this repository.
A noncontact acoustical system has been developed which measures Young's modulus of solid materials at high temperature with less than or equal to 0.05% accuracy, The system employs capacitive (or electrostatic) transducers to excite and detect vibrations of millimeter-sized resonant tuning forks, whose resonance frequencies alter with changing temperature and material properties. The use of tuning forks in their fundamental symmetric modes of vibration provide resonances of high Q's and eliminate irreversible frequency and drift effects that occur with other forms of resonator. The use of noncontact capacitive transducers reduces the damping and stresses that otherwise occur with contacting transducers, and allows the system to be simply and accurately modeled. Both single crystal silicon tuning forks, and those manufactured from hydrided and unhydrided Zr-2.5%Nb, were investigated at temperatures up to 700 degrees C. The measured responses of silicon forks confirmed the system accuracy, and suggested that single-crystal silicon be standardized as a calibration material for acoustical measurement systems, Results obtained with Zr-2.5%Nb tuning forks allowed an accurate quantitative analysis of the effects of hydride dissolution and precipitation on Young's modulus, and confirmed that Young's modulus of hydrided Zr-2.5%Nb decreases in proportion to free hydrogen concentration, This experimental system should prove valuable for accurate modeling of high-temperature material transformations in solids. (C) 1997 Acoustical Society of America.
|Item Type:||Journal Article|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)|
|Journal or Publication Title:||JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA|
|Publisher:||AMER INST PHYSICS|
|Official Date:||September 1997|
|Number of Pages:||14|
|Page Range:||pp. 1296-1309|
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