Non-linear material characterisation using the noncollinear method

Anthony J. Croxford; Paul D. Wilcox; Bruce W. Drinkwater

doi:10.1117/12.847233

8 April 2010 Non-linear material characterisation using the noncollinear method

Anthony J. Croxford, Paul D. Wilcox, Bruce W. Drinkwater

Proceedings Volume 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010; 76491X (2010) https://doi.org/10.1117/12.847233
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

Conventional ultrasonic NDT techniques are limited in their ability to detect small defects by the diffraction limit, that is there is much reduced sensitivity to defects smaller than the wavelength of the interrogating ultrasonic wave. While not a major issue for most inspection, this problem becomes particularly significant for the detection of fatigue damage prior to crack formation. In this regime conventional NDT has proven to be inadequate. For this reason significant effort has been expended on the development of non-linear techniques. These techniques rely on deviations of the material from linear stress strain behaviour which create harmonics in the resulting frequency response. Evidence suggests that changes to a materials condition, such as fatigue damage, change this non-linear response. This paper presents a non-linear inspection method using a non-collinear interaction. This technique has several advantages over other harmonic approaches in that there is spatial separation, modal separation and frequency separation of the non-linear signal. This allows the origin of the non-linear signal and underlying noise levels to be well defined. The capability of the technique is demonstrated using plastically strained material and samples subjected to low cycle fatigue.

Citation Download Citation

Anthony J. Croxford, Paul D. Wilcox, and Bruce W. Drinkwater "Non-linear material characterisation using the noncollinear method", Proc. SPIE 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010, 76491X (8 April 2010); https://doi.org/10.1117/12.847233

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KEYWORDS

Transducers

Nondestructive evaluation

Ultrasonics

Harmonic generation

Nonlinear optics

Reflection

Wave propagation

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