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22 April 2020 Experimental evaluation of the true intrinsic nonlinearity of rail steel using Rayleigh waves and a new nonlinearity parameter
Faeez Masurkar, Peter Tse
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Proceedings Volume 11381, Health Monitoring of Structural and Biological Systems XIV; 113811N (2020) https://doi.org/10.1117/12.2557374
Event: SPIE Smart Structures + Nondestructive Evaluation, 2020, Online Only
Abstract
The paper presents the experimental evaluation of the intrinsic nonlinearity of macroscopically pristine rail specimens using Rayleigh waves. A second harmonic is produced in the wave as a result of lattice-anharmonicity of Rail. The spectral amplitudes of the fundamental and generated second harmonics are then used to calculate the intrinsic nonlinearity of rail using a new amplitude-based nonlinearity parameter. The material nonlinearity of the rail steel evaluated using the experimental measurements and amplitude-based parameter are further compared with the nonlinear elasticity equations. The close agreement of the results shows the effectiveness of the proposed method in measuring the intrinsic nonlinearity of the rail steel.
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Faeez Masurkar and Peter Tse "Experimental evaluation of the true intrinsic nonlinearity of rail steel using Rayleigh waves and a new nonlinearity parameter", Proc. SPIE 11381, Health Monitoring of Structural and Biological Systems XIV, 113811N (22 April 2020); https://doi.org/10.1117/12.2557374
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KEYWORDS
Wave propagation
Near field
Transducers
Inspection
Acoustics
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