Proceedings ArticleDOI
Studies on the influence of axial bends on ultrasonic guided waves in hollow cylinders (pipes)
Bhupesh Verma,Krishnan Balasubramaniam,Prabhu Rajagopal +2 more
- Vol. 1511, Iss: 1, pp 175-182
TLDR
In this article, a 3D finite element (FE) simulation is used to illumine the propagation of fundamental guided pipe modes across bends of several different angles φ and bend radius regimes, exemplifying "sharp" and gradual or "slow" bends.Abstract:
Ultrasonic guided waves in hollow cylinders (pipes) are today widely applied as rapid screening tools in the inspection of straight pipe segments in oil, power generation and petrochemical processing industries. However, the characteristics of guided wave propagation across features such as bends in the pipe network are complicated, hampering a wider application of the developed techniques. Although a growing number of studies in recent years have considered guided wave propagation across elbows and U-type bends, the topic is still not very well understood for a general bend angle φ, mean bend radius R and pipe thickness b. Here we use 3D Finite Element (FE) simulation to illumine the propagation of fundamental guided pipe modes across bends of several different angles φ. Two different bend radius regimes, R/λ ≈ 1 and 10 (where λ denotes the wavelength of the mode studied) are considered, exemplifying 'sharp' and gradual or 'slow' bends. Different typical pipe thicknesses b within these regimes are also s...read more
Citations
More filters
Journal ArticleDOI
Parametric Study of Defect Detection in Pipes with Bend Using Guided Ultrasonic Waves
TL;DR: In this article, the propagation behavior of guided ultrasonic waves in a steel pipe with welded bend is studied by finite element simulation, and the effectiveness of the longitudinal L (0,2) and torsional T(0,1) guided waves in detecting circumferential cut near the weld is investigated.
Journal ArticleDOI
Computational model considerations of defect detection in pipes with bends using focused guided wave
TL;DR: In this article, the defect detectability in pipes with bends, using time delay focusing and synthetic focusing by common source method (CSM), was investigated using finite element simulation, and it was shown that the time-delay focusing technique improves the confidence in detecting a small defect (3.8% cross-sectional area) beyond the bend, but it is unable to detect defects close to other features like welds or bends.
References
More filters
Journal ArticleDOI
The interaction of Lamb waves with defects
D. N. Alleyne,Peter Cawley +1 more
TL;DR: The results indicate that Lamb waves may be used to find notches when the wavelength to notch depth ratio is on the order of 40, and the 2-D Fourier transform method is used to quantify Lamb wave interactions with defects.
Proceedings ArticleDOI
Change in mode configurations and propagation velocity of guided waves through an elbow section of a pipe
TL;DR: In this paper, the authors theoretically analyzes and experimentally verifies propagation of guided waves from a straight section to an elbow section of a pipe, and discusses change of the mode configurations and the propagation velocity under the influence of the elbow curvature of the pipe.