On the scattering of elastic waves from a non-axisymmetric defect in a coated pipe

• DOI: 10.1016/j.ultras.2015.09.019
• Publication Date: 2015-10-02T04:39:42Z
• Authors: Wenbo Duan; Ray Kirby; Peter Mudge
• Keywords: Acoustics and Ultrasonics; Hybrid finite element method; 0103 physical sciences; Guided wave; Dispersion and scattering analysis; Non-axisymmetric defect; 01 natural sciences; 620

Viscoelastic coatings are often used to protect pipelines in the oil and gas industry. However, over time defects areas of corrosion form these so it is desirable monitor structural integrity coated pipes using techniques similar those on uncoated pipelines. A common approach use ultrasonic guided waves that work pulse-echo principle; however, energy can be heavily attenuated by coating significantly reduce effective range techniques. Accordingly, develop a better understanding how propagate with view optimising test methodologies, this article uses hybrid SAFE-finite element model scattering from non-axisymmetric pipes. Predictions generated frequency domain shown longitudinal family modes likely have longer when compared torsional modes. Moreover, observed velocity pipe very group equivalent It also does not induce any additional mode conversion above seen for an incident wave scattered defect. studying one need account only attenuation imparted may normally neglect effect modal dispersion scattering.