压电材料平面渗透裂纹的机电耦合场  

Plane Coupled Solution for Piezoelectric Media with Electrically Permeable Crack

作　　者：刘新民[1] 

机构地区：[1]燕山大学建筑工程与力学学院

出　　处：《中国机械工程》2001年第z1期1-3,4,共4页China Mechanical Engineering

基　　金：国家"九五"攀登计划资助项目 ( PD95 2 190 9)

摘　　要：为提高压电传感器和换能器的品质 ,针对材料缺陷导致的压电元器件失效或不稳定 ,用复变函数的方法 ,结合椭圆形夹杂内的电场强度和电位移为常量这一早期研究结果 ,研究了压电材料平面电渗透裂纹的机电耦合场及其奇异性。解答表明 ,切向电场强度和法向电位移在裂纹尖端有由机械载荷引起的奇异 ,而与电载荷无关 ;应力强度因子与纯弹性材料结果一致。To enhance the characteristics of transducer and energy-transfered device made of piezoelectric materials,machinery-electric coupling field and its singularity of electrically permeable cracks for piezoelcetric materials are studied using complex function method and considering electric field strength and electric displacement inside elliptical inclusion as constants,namely early research results,for the failure or unstability of piezoelectric devices caused by material defects.It is shown from the solution that electric field strength and electric displacement have(1/2)types of singularity at the crack tip for the electrically permeable slit crack,and depend only on machine loads.The stress intensity factors are identical to the results of the problem elastic.

关 键 词：压电介质 裂纹 强度因子 耦合场 

分 类 号：TB39[一般工业技术—材料科学与工程] TB54[理学—物理]