1992年6月28日和1999年10月16日,位于美国南加州莫哈韦（Mojave）沙漠的加州东部形变剪切带（Eastern California Shear Zone,ECSZ）莫哈韦段先后发生2次7级以上走滑型地震,即MW7.3兰德斯（Landers）地震和MW7.1赫克托矿（Hector Mine...1992年6月28日和1999年10月16日,位于美国南加州莫哈韦（Mojave）沙漠的加州东部形变剪切带（Eastern California Shear Zone,ECSZ）莫哈韦段先后发生2次7级以上走滑型地震,即MW7.3兰德斯（Landers）地震和MW7.1赫克托矿（Hector Mine）地震。兰德斯地震和赫克托矿地震是地震学研究的经典震例,相关研究案例极大地推动了地震学研究的发展。展开更多
An efficient and accurate analytical model for piezoelectric bimorph based on the improved first-order shear defor- mation theory (FSDT) is developed in this work. The model combines the equivalent single-layer approa...An efficient and accurate analytical model for piezoelectric bimorph based on the improved first-order shear defor- mation theory (FSDT) is developed in this work. The model combines the equivalent single-layer approach for mechanical dis- placements and a layerwise-type modelling of the electric potential. Particular attention is devoted to the boundary conditions on the outside faces and to the interface continuity conditions of the bimorphs for the electromechanical variables. Shear correction factor (k) is introduced to modify both the shear stress and the electric displacement of each layer. And the detailed mathematical derivations are presented. Free vibration problem of simply supported piezoelectric bimorphs with series or parallel arrangement is investigated for the closed circuit condition, and the results for different length-to-thickness ratios are compared with those ob- tained from the exact 2D solution. Excellent agreements between the present model prediction with k=8/9 and the exact solutions are observed for the resonant frequencies.展开更多
文摘1992年6月28日和1999年10月16日,位于美国南加州莫哈韦（Mojave）沙漠的加州东部形变剪切带（Eastern California Shear Zone,ECSZ）莫哈韦段先后发生2次7级以上走滑型地震,即MW7.3兰德斯（Landers）地震和MW7.1赫克托矿（Hector Mine）地震。兰德斯地震和赫克托矿地震是地震学研究的经典震例,相关研究案例极大地推动了地震学研究的发展。
基金This research was supported by the National Natural Science Foundation of China （No. 59371039）；Professors E.A.Starke,Jr and R.P. Gangloff of University of Virginia is greatly appreciated.
基金Project (Nos. 10472102 and 10372089) supported by the NationalNatural Science Foundation of China
文摘An efficient and accurate analytical model for piezoelectric bimorph based on the improved first-order shear defor- mation theory (FSDT) is developed in this work. The model combines the equivalent single-layer approach for mechanical dis- placements and a layerwise-type modelling of the electric potential. Particular attention is devoted to the boundary conditions on the outside faces and to the interface continuity conditions of the bimorphs for the electromechanical variables. Shear correction factor (k) is introduced to modify both the shear stress and the electric displacement of each layer. And the detailed mathematical derivations are presented. Free vibration problem of simply supported piezoelectric bimorphs with series or parallel arrangement is investigated for the closed circuit condition, and the results for different length-to-thickness ratios are compared with those ob- tained from the exact 2D solution. Excellent agreements between the present model prediction with k=8/9 and the exact solutions are observed for the resonant frequencies.
