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Vibrational Technique for Stress Measurement in Films: II, Extensions and Complicating Effects
Author(s) -
Tong Quinn K.,
Maden Michele A.,
Jagota Anand,
Farris Richard J.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb05343.x
Subject(s) - anisotropy , materials science , stiffness , stress (linguistics) , bending , composite material , bending stiffness , measure (data warehouse) , ideal (ethics) , mechanics , optics , computer science , physics , linguistics , philosophy , epistemology , database
Several extensions and complicating effects in the vibrational technique for the measurement of stress in films are discussed in this, the second part of the study. The principles of the technique, based on ideal membrane behavior, and some applications were presented in the companion paper. Several complicating effects can be important due to deviation from ideal behavior. For lowdensity polymer membranes, air loading can shift the natural frequencies considerably. This effect is studied by measuring stress at different air pressures and compared to a theoretical model for the correction of air loading effects. The effect of bending stiffness can be important for thick and stiff films. This effect has been studied systematically and it is shown that it can be used to measure the stress and stiffness of the film simultaneously. A powerful extension of the technique to the measurement of anisotropic biaxial stresses is also demonstrated.