表面开口矩形缺陷兰姆波散射的边界元模拟  

Boundary element modeling of Lamb wave scattering on surface breaking rectangular defect

作　　者：卢超[1] 程建军[1] 陆铭慧[1] 

机构地区：[1]中国铁道科学研究院金属及化学研究所

出　　处：《南昌航空大学学报（自然科学版）》2008年第2期26-30,34,共6页Journal of Nanchang Hangkong University(Natural Sciences)

基　　金：铁道部科技研发计划重点项目(2007G040);无损检测技术教育部重点实验室开放基金项目(ZD200729004)

摘　　要：本文介绍了边界元法与兰姆波本征模式函数相结合的混合边界元法理论模型,用混合边界元法计算了铝板中A0模式兰姆波在表面开口矩形缺陷上的散射。通过数值计算,给出了不同频率下的模式转换特性和散射系数,并给出板中兰姆波传播和裂纹对兰姆波散射的波场快照,本文的研究工作对板状结构兰姆波无损检测技术的研究具有参考价值。In this paper, a hybrid boundary element model combining traditional boundary element method with Lamb wave normal mode expansion technique was introduced, and the new method was used to solve the scattering problem of AO Lamb wave by surface breaking rectangular defect in aluminum plate. Under variable frequencies, the reflection and transmission from the crack were calculated and mode conversion characterization was obtained. The snapshots of AO Lamb wave propagating in the plate and the scatter from the crack were presented. The method can be used for reference in nondestructive testing of plate - shaped structure using Lamb waves.

关 键 词：兰姆波 边界元方法 表面缺陷 散射 

分 类 号：O242[理学—计算数学]