Iranian Journal of Oil and Gas Science and Technology
Quarterly Publication

A Novel Method for Ultrasonic Evaluation of Horizontal Defects Using Time-of-Flight Diffraction

Document Type : Research Paper

Authors

Parastoo Bagheri 1
Sina Sodagar 1
Gholamreza Rashed 1
Amin Yaghootian 2

1 Department of Technical Inspection Engineering, Petroleum University of Technology, Abadan, Iran

2 Department of Mechanical Engineering, Shahid Chamran University, Ahwaz, Iran

https://doi.org/10.22050/ijogst.2014.7484
Abstract
Time-of-flight diffraction method (ToFD) is an amplitude-independent sizing method which is based on the measurement of time-of-flight of defect tip diffracted waves. Although ToFD can measure through-wall length of defect accurately, this method is not capable of measuring horizontal defect size. In this paper, a new ToFD method for evaluating horizontal planar defects is presented. The finite element method (FEM), using the ABAQUS software package, is employed to simulate the ultrasonic wave behavior in the test blocks and its interaction with the embedded planar defects. The phased array technology is also used to model the ultrasonic inspection system parameters. FEM simulation of the new ToFD method for different crack sizes shows that, compared to the conventional ToFD method, the accuracy of results is within acceptable range to use the novel technique for measuring the horizontal planar defects.

Keywords

Ultrasonic Wave
Diffracted Wave
Horizontal Planar Defects
ToFD

  • Receive Date 19 September 2013
  • Revise Date 27 February 2014
  • Accept Date 05 April 2014

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