Continuous wave phase detection for probing nonlinear elastic wave interactions in rocks

1991 ◽  
Vol 89 (2) ◽  
pp. 598-603 ◽  
Author(s):  
Paul A. Johnson ◽  
Albert Migliori ◽  
Thomas J. Shankland
Keyword(s):  
Elastic Wave ◽  
Continuous Wave ◽  
Phase Detection ◽  
Wave Interactions ◽  
Wave Phase ◽  
Nonlinear Elastic ◽  
Nonlinear Elastic Wave

scholarly journals Non-Classical Second-Order Nonlinear Elastic Wave Interactions

2019 ◽  
Author(s):  
Andriejus Demcenko ◽  
Michael Mazilu ◽  
Robert Wilson ◽  
Julien Reboud ◽  
Jonathan M. Cooper
Keyword(s):  
Elastic Wave ◽  
Second Order ◽  
Wave Interactions ◽  
Nonlinear Elastic ◽  
Nonlinear Elastic Wave

Acoustic Emission (AE) and Nonlinear Elastic Wave Spectroscopy (NEWS) for Online Monitoring of Concrete Curing

2006 ◽  
Vol 13-14 ◽  
pp. 213-220 ◽  
Author(s):  
Koen Van Den Abeele ◽  
W. Desadeleer ◽  
Geert de Schutter ◽  
Martine Wevers
Keyword(s):  
Acoustic Emission ◽  
Elastic Wave ◽  
Elastic Properties ◽  
Online Monitoring ◽  
Continuous Wave ◽  
Integrated System ◽  
Hydration Process ◽  
Linear And Nonlinear ◽  
Nonlinear Elastic ◽  
Nonlinear Elastic Wave

An integrated system of dynamic nondestructive experiments for material process monitoring is proposed, consisting of a combination of the AE technique with Nonlinear Elastic Wave Spectroscopy (NEWS). Using this system, we evaluate the microstructural properties of freshly poured concrete during hydration, with the ultimate goal to correlate these properties to its long-term behavior. The integrated system allows online monitoring of the condition parameters, of the internal microstructural activity by continuously triggering AE events and of the linear and nonlinear elastic properties of the microstructure through ultrasonic pulsed and continuous wave transmission measurements at regular time intervals. The internal temperature readings, the evolution in the acoustic emission events and the behavior of the linear and nonlinear elastic properties can be related to the different stages in the hydration process of concrete. The data are analyzed as a function of the degree of hydration for various concrete compositions during the first three days of the hydration process.

Nonlinear elastic wave propagation along free surfaces of a thick plate

1995 ◽  
Vol 97 (5) ◽  
pp. 3376-3376
Author(s):  
M. F. Hamilton ◽  
Yu. A. Il’inskii ◽  
E. A. Zabolotskaya
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Thick Plate ◽  
Elastic Wave Propagation ◽  
Free Surfaces ◽  
Nonlinear Elastic ◽  
Nonlinear Elastic Wave

Wave Motion of a Nonlinear Elastic Bar Subjected to Axial Excitation

2004 ◽  
Author(s):  
Liming Dai ◽  
Qiang Han
Keyword(s):  
Wave Propagation ◽  
Solitary Wave ◽  
Elastic Wave ◽  
Nonlinear Wave ◽  
Wave Motion ◽  
Initial Conditions ◽  
System Parameters ◽  
Elastic Bar ◽  
Nonlinear Elastic ◽  
Nonlinear Elastic Wave

This research intends to investigate the wave motion in a nonlinear elastic bar with large deflection subjected to an axial external exertion. A nonlinear elastic constitutive relation governs the material of the bar. General form of the nonlinear wave equations governing the wave motion in the bar is derived. With a modified complete approximate method, the asymptotic solution of solitary wave is developed for theoretical and numerical analyses of the wave motion. Various initial conditions and system parameters are considered for investigating the shape and propagation of the nonlinear elastic wave. With the governing equation of the wave motion of the bar and the solution developed, the characteristics of the nonlinear elastic wave of the bar are analyzed theoretically and numerically. Properties of the wave propagation and the effects of the system parameters of the bar and the influences of the initial conditions to the characteristics of the wave motion are investigated in details. Based on the theoretical analysis as well as the numerical simulations, it is found that the nonlinearity of the elastic bar may cause solitary wave in the bar. The velocity of the solitary wave propagating in the bar is related to the initial condition of the wave motion. This exhibits an obvious different characteristic between the nonlinear wave and that of the linear wave of an elastic bar. It is also found in the research that the solitary wave is a pulse wave with stable propagation. If the stability of the wave propagation is destroyed, the solitary wave will no longer exist. The results of the present research may provide guidelines for the wave motion analysis of nonlinear elastic solid elements.

Micro-damage diagnostics using nonlinear elastic wave spectroscopy (NEWS)

2001 ◽  
Vol 34 (4) ◽  
pp. 239-248 ◽  
Author(s):  
Koen E-A. Van Den Abeele ◽  
Alexander Sutin ◽  
Jan Carmeliet ◽  
Paul A. Johnson
Keyword(s):  
Elastic Wave ◽  
Damage Diagnostics ◽  
Nonlinear Elastic ◽  
Nonlinear Elastic Wave
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