Understanding of propagation phenomena of guided waves at various defects and estimation of defect shapes

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420021
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: The University of Tokushima
• Principal Investigator: Nishino Hideo 徳島大学, ソシオテクノサイエンス研究部, 教授 (50316890)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 非破壊検査 / 超音波 / 計測

Outline of Final Research Achievements

In this paper, novel approaches for estimating the defect shapes in piping using the defect signals of the guided waves were presented. To accomplish the aim of the research, minute observations of the propagation phenomena of the guided waves were carried out. The four approaches were as follows: (1) validation of the mathematical model of reflection at axisymmetric defects and novel method for estimation the defect shape, (2) verification of resonant phenomena of circumferential SH wave at non-axisymmetric defect and its application, (3) new method for narrowing the dead zone in the guided-wave-sensor, (4) suggestion for the efficient defect detection at an elbow part.

Free Research Field

超音波計測