薄肉円管周方向の波動伝搬のFEM解析と軸方向溝状欠陥の寸法同定

概要

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Circumferential wave propagation within pipe wall has been analyzed with an explicit finite element method under plane strain for thin walled steel pipes with an axial slot on the outer or inner surface as an artificial flaw. In the analysis, a plastic wedge of large attenuation is also taken into consideration to simulate the real pitch-catch measurement configuration with angle beam transducers. The numerical results show the pulse energy is not propagated along the path predicted by the ray theory. Namely, the pulse is propagated macroscopically along the circumference, however, the energy is carried locally along the radial direction. At the inner and outer surfaces of the pipe, the reflected and mode-converted waves are excited, thus the wave train becomes longer after multiple reflections. The numerical results of the received signal amplitude for various slot depths are in good agreement with the measured.
一般社団法人日本機械学会の論文
2001-01-25