- 作者: TSUNG-TSONG WU
- 中文摘要: The use of elastic waves to measure elastic properties as well as flaws in solid specimens has received much attention, and many important applications have been developed recently. This paper summarizes some of the recent results in applying elastic waves to nondestructive evaluation (NDE) of isotropic as well as anisotropic materials. This paper is divided into four parts, the first part describes the theoretical background of surface waves in an anisotropic layered medium, where sextic formalism of surface waves is adopted. The second part introduces numerical simulations of 2-D and 3-D transient elastic waves propagating in plate structures that contain cracks and/or flaws. In the third part, some of the applications of laser generated surface waves used to determine anisotropic elastic constants and bonding conditions in layered media are described. In the last part, a newly developed method for determining concrete elastic constants and recently developed methods for detection of surface breaking cracks in concrete using transient elastic waves are described.
- 英文摘要: --
- 中文關鍵字: elastic wave, nondestructive evaluation, anisotropy, crack, concrete
- 英文關鍵字: --