The Numberical Simulation on Magnetostrictive Guided Wave for Cracks Inspection in Pipelines
Based on the theory of elastodynamics , the relationship between the amplitude of crack reversed echo and the size of crack which detection by the T(0,1) modal is studied by the method of simulation. Based on the simulation result, T(0,1) modal sensitive to a radial crack which length below the perimeter of pipe and the reflection ratio increase as the length of crack raised are got. The T(0,1) modal is insensitivity to a permeate axial crack which length between 20% to 45% of wavelength. The reflectance became minimum when the length arrive at 50% of wavelength, it get maximum when size reach 90% of wavelength, then it has a small decrease till 100%.
S. R. Long et al., "The Numberical Simulation on Magnetostrictive Guided Wave for Cracks Inspection in Pipelines", Applied Mechanics and Materials, Vol. 235, pp. 192-197, 2012