Effect of Initial Stress on Dispersion Relation for Transverse Piezoelectric Waves on A Layered Cylinder
作者单位：Faculty of Education for GirlsGazanKingdom of Saudi Arabia
会议名称：《第二届全国压电和声波理论及器件技术研讨会》
会议日期：2006年
学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学]
关 键 词：Piezoelectricity Wave propagation Dispersion relation Transverse surthce waves Initial stress Hexagonal crystals
摘 要：Effect of initial stress on dispersion relation for transverse surface waves circulating around a piezoelectric cylinder covered with a perfectly conducting layer is *** overlay materials are considered:namely,Gold and *** piezoelectric substrate is considered to have the symmetry of a hexagonal crystal,and the layer is a perfectly *** dispersion equation has been derived for the two overlays materials in the form of determinant involving Bessel *** roots of the dispersion equation give the values of the characteristic circular frequency parameters of the first three modes for various *** roots are numerically calculated byBisection method iterations techniqueand presented graphically for various thickness of the overlayer and for different values of the initial *** effect of the initial stress on the natural frequencies is illustrated on the *** is found that both the thickness of the overlayer and the initial stress have a substantial effect on the dispersion ***,it is seen that dispersion relation for a PZT-4 core covered by A Gold is much smaller than of the Aluminum *** results obtained in this paper not only may help us insight into the electro-mechanical coupling behavior of the piezoelectric composites cylinders,but also can offer theoretical basis and meaningful suggestion for the design of piezoelectric probes and electro-acoustic devices in the nondestructive evaluation ***,the results are compared graphically when the overlay is Gold or Aluminum and with those do not have initial stress and electric field which have been studied in the classical cases.