LAMB WAVE SCATTERING BY A PAIR OF SURFACE-BREAKING INCLINED CRACKS IN A PLATE

摘要：

Lamb wave scattering in an infinite,isotropic,homogeneous and linear elastic plate which contains a pair of surface-breaking inclined notch is evaluated.An inclined crack can be approached by vanishing the width of the inclined notch.The scattering of Lamb waves from geometric discontinuities involves all these wave modes which contain a finite number of propagating modes having real wave-numbers,a finite number of non-propagating modes having imaginary wave-numbers and an infinite number of in-homogeneous modes having complex wave numbers in order to satisfy the boundary conditions.The scattering field is expanded in terms of complex Lamb wave modes with unknown amplitudes.The complex mode expansion and vector projection (CMEP) method is used to deduce the solving process about these unknown amplitudes.We discuss the influences of the different length of the symmetric and asymmetric crack on the amplitudes of lamb wave scattering fields respectively.Results provide theoretical guidance for Structural Health Monitoring (SHM) using the lamb wave generation devices.

关键词： Lamb wave Inclined crack CMEP Scattering

作者: Li-yun CAO Yan-long XU Zhi-chun YANG

作者单位: School of Aeronautics, Northwestern Polytechnical University, Xian, 710072, P.R. China

会议类型: 国际会议

会议名称: The 2016 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2016全国压电和声波理论及器件技术研讨会)

会议地点: 西安

会议语种:英文

页码: 323-326

在线出版日期: 2016-10-21（万方平台首次上网日期，不代表论文的发表时间）