The orthotropic mechanical sensor of piezoelectric compositematerial made from piezoelectric ceramic and resin materials andtheir sensing mechanism are presented. The sensing equations of thead- hered- and embedded-ty...The orthotropic mechanical sensor of piezoelectric compositematerial made from piezoelectric ceramic and resin materials andtheir sensing mechanism are presented. The sensing equations of thead- hered- and embedded-type sensing units are deduced, which areused to detect the stresses in orthotropic material structures. Thesurface strain of the orthogonal plate is measured under the actionof the planar stress field, and the error is analyzed.展开更多
A dynamic mode) for 2-2 piezo-composite material was developed,in which the acoustic plane waves propagating along the interface were solved and their dispersion curves were obtained.By taking the resonator thickness ...A dynamic mode) for 2-2 piezo-composite material was developed,in which the acoustic plane waves propagating along the interface were solved and their dispersion curves were obtained.By taking the resonator thickness as half a wavelength or its odd fold,the resonant frequencies of the composite transducers are in agreement with the dispersion curves.From the dynamic model the piezoelectric coupling coefficients for the thickness vibration of the composite could be obtained as a function of the composite thickness as well as the volume fraction of the ceramic phase.The results show that when the thickness vibration mode is decoupled with the lateral periodical vibration mode,the piezoelectric coupling reaches its maximum.This condition gives a maximum frequency bandwidth and a greatest piezoelectric coupling coefficient for the composite material.展开更多
基金the National Natural Science Foundation (No.59635640)the Science Foundation of Jiangsu Education Committee (99KJD130001)the Science Foundation of Jiangsu Province (BK99116).
文摘The orthotropic mechanical sensor of piezoelectric compositematerial made from piezoelectric ceramic and resin materials andtheir sensing mechanism are presented. The sensing equations of thead- hered- and embedded-type sensing units are deduced, which areused to detect the stresses in orthotropic material structures. Thesurface strain of the orthogonal plate is measured under the actionof the planar stress field, and the error is analyzed.
基金Project supported by the National Natural Science Foundation of China.
文摘A dynamic mode) for 2-2 piezo-composite material was developed,in which the acoustic plane waves propagating along the interface were solved and their dispersion curves were obtained.By taking the resonator thickness as half a wavelength or its odd fold,the resonant frequencies of the composite transducers are in agreement with the dispersion curves.From the dynamic model the piezoelectric coupling coefficients for the thickness vibration of the composite could be obtained as a function of the composite thickness as well as the volume fraction of the ceramic phase.The results show that when the thickness vibration mode is decoupled with the lateral periodical vibration mode,the piezoelectric coupling reaches its maximum.This condition gives a maximum frequency bandwidth and a greatest piezoelectric coupling coefficient for the composite material.
