The reflection of the fundamental torsional guided wave from multiple circular holes in pipes

被引：76

作者：

Lovstad, Anders ^{[1
]}

Cawley, Peter ^{[2
]}

机构：

[1] Norwegian Univ Sci & Technol, NTNU, N-7491 Trondheim, Norway

[2] Univ London Imperial Coll Sci Technol & Med, UK Res Ctr NDE, London SW7 2AZ, England

来源：

NDT & E INTERNATIONAL | 2011年 / 44卷 / 07期

关键词：

Guided waves; Localised corrosion; Circular holes; Superposition; LOW-FREQUENCY REFLECTION; THROUGH-THICKNESS HOLE; LONG-RANGE INSPECTION; SHEAR HORIZONTAL MODE; LAMB WAVES; SCATTERING; DEFECTS; PLATE; CORROSION; NOTCHES;

D O I：

10.1016/j.ndteint.2011.05.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Localised corrosion is a major concern in the petrochemical industry, and often occurs as clusters of pits. A study of the reflection from two and three small circular holes in pipes with the fundamental torsional guided wave incident is presented. FE analyses with both part and through thickness holes at different relative positions are presented, and are a step towards estimation of the scattering behaviour of multiple and random defects. The validity of employing the superposition technique in estimating reflection coefficients is assessed. Results show that the reflection coefficient for the T(0,1) mode is dependent on absolute frequency and axial separation, and independent of circumferential position. Employing superposition is found to be valid down to defect centre to centre separation distances of two diameters in the worst case, with improved validity with shallower defects. Results from the FE analyses are validated experimentally. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：553 / 562

页数：10

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