An FEM simulation for guided elastic wave generation and reflection in hollow cylinders with corrosion defects
An FEM simulation for guided elastic wave generation and reflection in hollow cylinders with corrosion defects
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DOI：
10.1115/1.1428331
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发表时间：
2002-02-01
影响因子：
1
通讯作者：
Zhu, W
中科院分区：
文献类型：
--
作者：
Zhu, W
为了对管状结构进行无损检测，对含腐蚀缺陷的空心圆柱体中弹性导波的产生和反射进行了数值研究。一种新的导波换能器模型，时间延迟周期，环形阵列（TDPRA），已被用来产生轴对称导波模式在空心圆柱，这是通过有限元计算模拟。根据相长干涉和相消干涉的原理，通过设置TDPRA的参数，可以实现单向导波发射。分别用二维和三维有限元模拟方法分析了导波在轴对称和非轴对称腐蚀缺陷中的反射。讨论了L（0，1）和L（0，2）模入射时的反射特性和模式转换。与腐蚀深度、轴向和周向范围有关。
The generation and reflection of guided elastic waves in hollow cylinders with corrosion defects have been investigated numerically for the purpose of nondestructive evaluation (NDE) of tubular structures. A new guided wave transducer model, time-delay periodic, ring arrays (TDPRAs), has been used to generate the axisymmetric guided wave modes in hollow cylinders, and this is simulated by a finite element calculation. Unidirectional guided wave emission can be achieved by arranging a TDPRA's parameters according to the principle of constructive and destructive interference. The guided wave reflections by axisymetric and nonaxisymmetric corrosion defects are analyzed using a 2-D and a 3-D FE simulation, respectively. The reflection features as well as mode conversion under the L (0, 1) and L (0,2) mode incidences are discussed it? association with the corrosion depth, the axial and circumferential extents in hollow cylinders.