EFFECTS OF EXTERNAL FORCES (TRANSIENT AND PERMANENT).
Quarterly rept. no. 2, 1 Aug-31 Oct 65,
LOWELL TECHNOLOGICAL INST RESEARCH FOUNDATION MASS
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In further research on the reactions of an excited piezoelectric crystal plate to the application of external forces and torques, a more extended study has been made of superimposed force fields set up in AT-cut piezoids. New instances here reported upon with respect to both single and superimposed force arrangements include a rectangular plates with edges rotated in the XZ plane, b larger plates than those previously used, and c combinations of tensile and compressive forces applied simultaneously. Results obtained with shearing stresses, some of them quite large, in rectangular and circular plates are reported. Experiments carried out in the application of transient forces to oscillating crystals are discussed. Nonlinear theory is applied to the complete range of X-rotated cuts and the results are assayed by the degree of fit between experimental and theoretical curves. Author