Proceedings ArticleDOI
A novel and practical approach for determination of the acoustic nonlinearity parameter using a pulse-echo method
Hyunjo Jeong,Shuzeng Zhang,Daniel J. Barnard,Xiongbing Li +3 more
- Vol. 1706, Iss: 1, pp 060006
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TLDR
In this article, a feasibility study is performed to assess the possibility of using pulse-echo methods in determining the nonlinearity parameter β of solids with a stress-free boundary.Abstract:
Measurements of the acoustic nonlinearity parameter β are frequently made for early detection of damage in various materials. The practical implementation of the measurement technique has been limited to the through-transmission setup for determining the nonlinearity parameter of the second harmonic wave. In this work, a feasibility study is performed to assess the possibility of using pulse-echo methods in determining the nonlinearity parameter β of solids with a stress-free boundary. The multi-Gaussian beam model is developed based on the quasilinear theory of the KZK equation. Simulation results and discussion are presented for the reflected beam fields of the fundamental and second harmonic waves, the uncorrected β behavior and the properties of total correction that incorporate reflection, attenuation and diffraction effects.read more
Citations
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Journal ArticleDOI
Optimization and Validation of Dual Element Ultrasound Transducers for Improved Pulse-Echo Measurements of Material Nonlinearity
TL;DR: In this paper, a dual-element transducer with an outer ring transmitter and an inner disk receiver is optimized for 1 cm-thick Al specimens at 5 MHz fundamental frequency, and the results are presented for the received second harmonic amplitude and the total correction.
Journal ArticleDOI
Dual Element Transducer Approach for Second Harmonic Generation and Material Nonlinearity Measurement of Solids in the Pulse-Echo Method
TL;DR: In this paper, a dual element transducer composed of the annular ring emitter and the inner disk receiver was used for nonlinearity parameter (β) measurements of solid specimens in the pulse-echo testing configuration.
Journal ArticleDOI
Application of Fresnel Zone Plate Focused Beam to Optimized Sensor Design for Pulse-Echo Harmonic Generation Measurements.
TL;DR: This paper investigates the optimal sensor design for pulse-echo SHG and β measurements using Fresnel zone plate (FZP) focused beams and shows that the optimally designed sensors for 1 cm thick aluminum can produce the second harmonic amplitude and the uncorrected nonlinear parameter corresponding to the through-transmission method.
Journal ArticleDOI
Improvement of pulse-echo harmonic generation from a traction-free boundary through phase shift of a dual element transducer.
TL;DR: A dual element transducer with phase shift is proposed for enhanced second harmonic generation and the validity of the phase shift concept is confirmed by comparing the enhanced generation of second harmonic amplitudes and the resulting nonlinear parameters with the rigid‐boundary case equivalent to the conventional through‐transmission setup.
Journal ArticleDOI
Second-harmonic generation in focused beam fields of phased-array transducers in a nonlinear solid with a stress-free boundary
TL;DR: The fundamental and second-harmonic beam fields that are focused and reflected at the stress-free and rigid boundaries are calculated and their properties are investigated in terms of the received average fields.
References
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Journal ArticleDOI
Experimental characterization of fatigue damage in a nickel-base superalloy using nonlinear ultrasonic waves
TL;DR: In this article, the authors developed a robust experimental procedure to track the evolution of fatigue damage in a nickel-base superalloy with the acoustic nonlinearity parameter, β, and demonstrates its effectiveness by making repeatable measurements of β in multiple specimens, subjected to both high and low-cycle fatigue.
Journal ArticleDOI
Nonlinear ultrasonic characterization of fatigue microstructures
John H. Cantrell,William T. Yost +1 more
TL;DR: In this article, a model of ultrasonic wave-dislocation dipole interactions is developed that quantifies the wave distortion by means of a material nonlinearity parameter (beta).
Journal ArticleDOI
In situ characterization of fatigue damage evolution in a cast Al alloy via nonlinear ultrasonic measurements
TL;DR: In this paper, a new methodology is described for in situ characterization of fatigue damage accumulation using nonlinear ultrasonic measurements via analysis of the feedback signal of a closed-loop ultrasonic fatigue system.
Journal ArticleDOI
The generation of second harmonic waves in an isotropic solid with quadratic nonlinearity under the presence of a stress-free boundary
TL;DR: In this paper, the authors examined the interaction of an incident longitudinal wave with a stress-free boundary, determining all the second harmonic waves generated at this boundary and in the bulk.
Journal ArticleDOI
Relation of finite amplitude waves to third order elastic constants
O. Buck,Donald O. Thompson +1 more
TL;DR: Using non-linear elasticity theory, calculations of the amplitudes of second harmonics generated in a cubic solid by finite amplitude ultrasonic waves of different polarization and propagation vectors in a {110} type plane have been made.