Cubic nonlinearity parameter measurement and material degradation detection using nonlinear ultrasonic three-wave mixing

Ultrasonics ◽  
2021 ◽  
pp. 106670
Author(s):  
Santhakumar Sampath ◽  
Hoon Sohn
Keyword(s):  
Parameter Measurement ◽  
Nonlinearity Parameter ◽  
Wave Mixing ◽  
Cubic Nonlinearity ◽  
Material Degradation ◽  
Nonlinear Ultrasonic

scholarly journals Research on Fatigue Damage of Compressor Blade Steel KMN-I Using Nonlinear Ultrasonic Testing

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Pengfei Wang ◽  
Weiqiang Wang ◽  
Jianfeng Li
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Ultrasonic Testing ◽  
Early Stage ◽  
Compressor Blade ◽  
Nonlinearity Parameter ◽  
Nonlinear Ultrasonic ◽  
Blade Steel ◽  
Scanning Electron ◽  
Peak Value

The fatigue damage of compressor blade steel KMN-I was investigated using nonlinear ultrasonic testing and the relation curve between the material nonlinearity parameter β and the fatigue life was obtained. The results showed that the nonlinearity parameter increased first and then decreased with the increase of the fatigue cycles. The microstructures were observed by scanning electron microscopy (SEM). It was found that some small defects like holes and pits appeared in the material matrix with the increase of the fatigue cycles, and the nonlinearity parameter increased correspondingly. The nonlinearity parameter reached the peak value when the microcracks initiated, and the nonlinearity parameter began to decrease when the microcracks further propagated to macrocracks. Therefore, it is proved that the nonlinearity parameter can be used to characterize the initiation of microcracks at the early stage of fatigue, and a method of evaluating the fatigue life of materials by nonlinear ultrasonic testing is proposed.

PHOTOREFRACTIVE AND PHOTOCONDUCTIVE FEATURES OF THE NANOSTRUCTURED MATERIALS

2010 ◽  
Vol 24 (06n07) ◽  
pp. 695-702 ◽  
Author(s):  
NATALIA V. KAMANINA ◽  
SERGEY V. SEROV ◽  
VICTOR P. SAVINOV ◽  
DRAGAN P. USKOKOVIĆ
Keyword(s):  
Nanostructured Materials ◽  
Carrier Mobility ◽  
Nonlinear Refraction ◽  
Organic Thin Films ◽  
Charge Carrier Mobility ◽  
Optical Parameters ◽  
Wave Mixing ◽  
Cubic Nonlinearity ◽  
Spatial Frequencies ◽  
532 Nm

Photoconductive and photorefractive characteristics of fullerene- and nanotubes-doped organic thin films based on conjugated organics, such as polyimide, polyaniline, pyridine, etc. have been studied. In addition, the liquid crystal mesophase with nanoobjects has been investigated. The increase of the charge carrier mobility of nanosensitized organics has been established. The nonlinear refraction and cubic nonlinearity have been investigated at wavelength of 532 nm via four-wave mixing technique using Raman-Nath diffraction regime. The thin holographic grating has been written at the spatial frequencies placed in the range of 90-150 mm-1. The energy density has been chosen in the range of 0.1-0.9 J × cm -2. The correlation between photoconductive and nonlinear optical parameters has been revealed. The nanostructured materials can be proposed for different area of nano- and microelectronic applications.

Measuring acoustic nonlinearity parameter using collinear wave mixing

2012 ◽  
Vol 112 (2) ◽  
pp. 024908 ◽  
Author(s):  
Minghe Liu ◽  
Guangxin Tang ◽  
Laurence J. Jacobs ◽  
Jianmin Qu
Keyword(s):  
Nonlinearity Parameter ◽  
Wave Mixing ◽  
Acoustic Nonlinearity Parameter ◽  
Acoustic Nonlinearity

Nonlinearity Parameter Measurement for Polymer Plates Using Focused Ultrasound

2008 ◽  
Author(s):  
Shigemi Saito ◽  
Bengt Enflo ◽  
Claes M. Hedberg ◽  
Leif Kari
Keyword(s):  
Focused Ultrasound ◽  
Parameter Measurement ◽  
Nonlinearity Parameter

Scanning non-collinear wave mixing for nonlinear ultrasonic detection and localization of plasticity

2018 ◽  
Vol 93 ◽  
pp. 1-6 ◽  
Author(s):  
Maoxun Sun ◽  
Yanxun Xiang ◽  
Mingxi Deng ◽  
Jichao Xu ◽  
Fu-Zhen Xuan
Keyword(s):  
Wave Mixing ◽  
Ultrasonic Detection ◽  
Nonlinear Ultrasonic ◽  
Detection And Localization
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