摘要 :
Macro fiber composite (MFC) is widely used in the field of vibration control because of its strong actuation ability and good flexibility. The actuation ability of MFC is greatly affected by the existence of electric field “dead ...
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Macro fiber composite (MFC) is widely used in the field of vibration control because of its strong actuation ability and good flexibility. The actuation ability of MFC is greatly affected by the existence of electric field “dead zone” on the interdigital electrode. In this paper, a new type of piezoelectric fiber composite structure with embedded interdigital electrode is proposed. The influence of electrode structure and key structural parameters of piezoelectric fiber on the electric field characteristics and actuation performance of the composite is analyzed by finite element method. The results show that compared with the surface interdigital electrode structure, the electric field distribution of the embedded interdigital electrode structure is more uniform, and the actuation strain of the piezoelectric fiber composite can reach 1.48 times of that of the surface interdigital electrode; the actuation strain increases with the decrease of electrode spacing, and increases with the increase of fiber volume fraction, and the actuation strain first increases and then decreases, and the best effect is achieved when the volume fraction is 70% When the thickness is 0.5mm, the actuation strain of the embedded interdigital electrode can be more than three times that of the interdigital electrode.
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摘要 :
Macro fiber composite (MFC) is widely used in the field of vibration control because of its strong actuation ability and good flexibility. The actuation ability of MFC is greatly affected by the existence of electric field “dead ...
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Macro fiber composite (MFC) is widely used in the field of vibration control because of its strong actuation ability and good flexibility. The actuation ability of MFC is greatly affected by the existence of electric field “dead zone” on the interdigital electrode. In this paper, a new type of piezoelectric fiber composite structure with embedded interdigital electrode is proposed. The influence of electrode structure and key structural parameters of piezoelectric fiber on the electric field characteristics and actuation performance of the composite is analyzed by finite element method. The results show that compared with the surface interdigital electrode structure, the electric field distribution of the embedded interdigital electrode structure is more uniform, and the actuation strain of the piezoelectric fiber composite can reach 1.48 times of that of the surface interdigital electrode; the actuation strain increases with the decrease of electrode spacing, and increases with the increase of fiber volume fraction, and the actuation strain first increases and then decreases, and the best effect is achieved when the volume fraction is 70% When the thickness is 0.5mm, the actuation strain of the embedded interdigital electrode can be more than three times that of the interdigital electrode.
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摘要 :
The stability of SiC and SiO_2 in helium with little water vapor is studied in this paper in order to confirm whether they can service as anti-oxidation layers on the surface of fuel elements of high temperature gas-cooled reactor...
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The stability of SiC and SiO_2 in helium with little water vapor is studied in this paper in order to confirm whether they can service as anti-oxidation layers on the surface of fuel elements of high temperature gas-cooled reactor (HTR) under water-ingress accident. Through thermodynamic analysis, it is found that the influence factor controlling the critical temperature of passive oxidation for SiC in He-H_2O is the partial pressure of H_2O;; the critical temperature of passive oxidation for SiC increases with the partial pressure of H_2O. The influence factors controlling the critical temperature of decomposition for SiO_2 are the partial pressure of H_2O and the amount of H_2O in gas for 1 mol SiO_2, the critical temperature of decomposition for SiC"2 increases with the partial pressure of H_2O while it decreases with the amount of H_2O in gas for 1 mol SiO_2. SiCVSiC composite coating is more suitable than SiC coating in He-H_2O with little H_2O.
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