表面贴有压电片的桁架结构系统静力可靠性分析(英文)

对表面贴有压电片的主动杆单元组成的桁架结构系统,在考虑电荷载和机械荷载联合作用的机电耦合效应时,利用力学原理,建立了静力分析的有限元模型。同时研究了压电杆元的破坏机理,给出压电杆单元破坏的判断准则。以材料的断裂强度、损伤电场强度、杆元的截面积和外荷载等为随机变量,建立了压电桁架结构单元的安全余量的表达式。并在此基础上,引入随机有限元法和结构系统可靠性理论,对该桁架结构系统进行可靠性分析。最后由算例说明本文方法的有效性。

Static Force Reliability Analysis of Truss Structure with Piezoelectric Patches Affixed to Its Surface

For the truss structure composed of active-elements with piezoelectric patches affixed to its surface,taking the mechani-cal-electric coupling effect under the action of electric loads and mechanical loads into consideration,the finite element model for static force analysis is established by using the theory of mechanics. The failure mechanism of piezoelectric elements is discussed and the failure criteria of piezoelectric elements are proposed. The expression of safety margins for the element of piezoelec...