scholarly journals Experimental and Numerical Study of Nonlinear Lamb Waves of a Low-Frequency S0 Mode in Plates with Quadratic Nonlinearity

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2096 ◽  
Author(s):  
Xiangyan Ding ◽  
Youxuan Zhao ◽  
Ning Hu ◽  
Yaolu Liu ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Lamb Waves ◽  
Numerical Study ◽  
Low Frequency ◽  
Nonlinear Behavior ◽  
Quadratic Nonlinearity ◽  
Nonlinearity Parameter ◽  
Experimental Measurements ◽  
Weak Nonlinearity ◽  
Acoustic Nonlinearity Parameter ◽  
Acoustic Nonlinearity

This paper investigates the propagation of low-frequency S0 mode Lamb waves in plates with quadratic nonlinearity through numerical simulations and experimental measurements. Both numerical and experimental results manifest distinct ultrasonic nonlinear behavior which is mainly presented by the second harmonics. Meanwhile, we find that both the acoustic nonlinearity parameter and dispersion distance show the exponential decay trend with the increase of frequency-thickness. Moreover, the results reveal that the frequency is key to affect the acoustic nonlinearity parameter and dispersion distance with the same frequency-thickness. This study theoretically and experimentally reveals that nonlinear Lamb waves of the low-frequency S0 mode are feasible to quantitatively identify material weak nonlinearity in plates.

scholarly journals Acoustic Nonlinearity Parameter B/A, Internal Pressure, and Acoustic Impedance Determined at Pressures up to 100 MPa for 1-Ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide

2016 ◽  
Vol 41 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Edward Zorębski ◽  
Michał Zorębski ◽  
Marzena Dzida
Keyword(s):  
Ionic Liquid ◽  
Internal Pressure ◽  
Acoustic Impedance ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Thermodynamic Method ◽  
Nonlinearity Parameter ◽  
Molecular Liquids ◽  
Acoustic Nonlinearity Parameter ◽  
Acoustic Nonlinearity

Abstract The nonlinearity parameter B/A, internal pressure, and acoustic impedance are calculated for a room temperature ionic liquid, i.e. for 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide for temperatures from (288.15 to 318.15) K and pressures up to 100 MPa. The B/A calculations are made by means of a thermodynamic method. The decrease of B/A values with the increasing pressure is observed. At the same time B/A is temperature independent in the range studied. The results are compared with corresponding data for organic molecular liquids. The isotherms of internal pressure cross at pressure in the vicinity of 70 MPa, i.e. in this range the internal pressure is temperature independent.

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