scholarly journals Anomalous wave propagation in quasiisotropic media

2006 ◽  
Vol 267 (1) ◽  
pp. 271-277 ◽  
Author(s):  
Hailu Luo ◽  
Weixing Shu ◽  
Fei Li ◽  
Zhongzhou Ren
Keyword(s):  
Wave Propagation ◽  
Anomalous Wave

Laser ultrasonic anomalous wave propagation imaging method with adjacent wave subtraction: Algorithm

2012 ◽  
Vol 44 (5) ◽  
pp. 1507-1515 ◽  
Author(s):  
Jung-Ryul Lee ◽  
Chen Ciang Chia ◽  
Chan-Yik Park ◽  
Hyomi Jeong
Keyword(s):  
Wave Propagation ◽  
Imaging Method ◽  
Laser Ultrasonic ◽  
Anomalous Wave

Anomalous Wave Propagation in Topological Transition Metasurfaces

2019 ◽  
Vol 7 (11) ◽  
pp. 1801483 ◽  
Author(s):  
Peixia Zheng ◽  
Quan Xu ◽  
Xiaoqiang Su ◽  
Dongyang Wang ◽  
Yuehong Xu ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Topological Transition ◽  
Anomalous Wave

Aircraft Wing Inspection Based on Anomalous Wave Propagation Imaging

2010 ◽  
Vol 123-125 ◽  
pp. 879-882 ◽  
Author(s):  
Jung Ryul Lee ◽  
Chen Ciang Chia ◽  
Hye Jin Shin ◽  
Jong Heon Kim ◽  
Chan Yik Park
Keyword(s):  
Wave Propagation ◽  
Health Management ◽  
Impact Damage ◽  
Engineering Structures ◽  
Structural Health ◽  
Non Destructive Evaluation ◽  
Anomalous Wave ◽  
Structural Health Management ◽  
The Impact ◽  
Non Destructive

Non-destructive evaluation (NDE) and structural health management (SHM) with the ability to evaluate the severity of a damage are important to ensure the reliability of a structure. We propose a local non-destructive evaluation (NDE) system based on Anomalous Wave Propagation Imaging (AWPI) method. When possible damage is flagged during the lifecycle of the structure, the proposed system will be launched for automatic damage evaluation. This technology was demonstrated on a CFRP skin-spar-stringers wingbox integrated with an AE sensor. 17 mm diameter impact damage was made between the stringers using hammer strike from outer surface of the skin. Based on the impact location determined by other global structural health monitoring system, the AWPI automatically inspects an area 400×400 mm2 with the impacted location enclosed. Anomalous Wave Propagation Movie (AWPM) was generated as inspection result. As contrast to its predecessor, the AWPM shows only the damage induced ultrasonic wave (anomalous wave), making the damage detection an intuitive decision making process. Precise damage localization was performed by identifying the location of area with anomalous wave propagation in the AWPM. Besides, the size of the area with anomalous wave agreed well with the size of impact damage, which demonstrated that damage size quantification is possible using the proposed system. Being sensitive only to anomalous wave, it is expected that this NDE system is exceptionally suitable not only for aircraft structures such as wingbox with stiffeners, but also for other complex engineering structures.

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

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