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Structure and electrical properties of Bi0.5(Na, K)0.5TiO3-BiGaO3 lead-free piezoelectric ceramics
Changrong Zhou,Xinyu Liu,Weizhou Li,Changlai Yuan,Guohua Chen 한국물리학회 2010 Current Applied Physics Vol.10 No.1
Lead-free piezoelectric ceramics (1 - x - y)Bi0.5Na0.5TiO3-xBi0.5K0.5TiO3- yBiGaO3 have been fabricated by an ordinary sintering technique, and their structure and electrical properties and depolarization temperature have been studied. The results of X-ray diffraction reveal that Bi0.5K0.5TiO3 and BiGaO3 diffuse into the Bi0.5Na0.5TiO3 lattices to form a new solid solution with a pure perovskite structure. An obvious change in microstructure with increasing concentration of Bi0.5K0.5TiO3 and BiGaO3 was observed. The piezoelectric constant d33 and the electromechanical coupling factor kp of the ceramics attain maximum values of 165 pC/N and 0.346 at y = 0.01(x = 0.18) and x = 0.21(y = 0.01), respectively. The temperature dependence of dielectric constant indicates an obvious relaxor characteristic with strong frequency dependence of dielectric constant. The depolarization temperature decreased with increasing content of BiGaO3 and first decreases and then increases with increasing amount of Bi0.5K0.5TiO3.
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Changrong Yao,Chuan Xu,Xun Zhou,Qiaochao Liu,Bin Qiang 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.8
Debris flows represent a prevalent natural disaster in mountainous regions, frequentlydevastating roads, bridges, and other vital transportation infrastructures due to their abruptonset and immense destructive power. This study introduces a three-dimensional numericalmodel that employs the SPH-FEM adaptive coupling algorithm to examine the destructionprocess of bridge piers under the influence of debris flows. It conducts flume experiments toassess the effectiveness of this approach. The findings indicated that the coupled SPH-FEMmethod, combined with a cross-rheological model, effectively captures the dynamicprogression of debris flows and accurately calculates the impact forces exerted on a pier. Theprocess is subsequently simulated in the LS-DYNA software by analyzing the destruction of theLiziyida Bridge in Sichuan Province, China, as a case study. The research proposes anempirical model for estimating the impact force of debris flows on piers derived from thenumerical simulations and additional flow tests around piers. These results offer theoreticalinsights and a design framework for debris flow disaster prevention and mitigation projects.
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