Wyniki wyszukiwania - BazTech

1

Theoretical and experimental analysis of guided wave propagation in plate-like structures with sinusoidal thickness variations

Zima Beata, Moll Jochen

Archives of Civil and Mechanical Engineering

|

2023

|

Vol. 23, no. 1

art. no. e34, 2023

EN

Guided waves have attracted significant attention for non-destructive testing (NDT) and structural health monitoring (SHM) due to their ability to travel relatively long distances without significant energy loss combined with their sensitivity to even small defects. Therefore, they are commonly used in damage detection and localization applications. The main idea of incorporating guided waves in NDT and SHM is based on processing the received signals and appropriate interpretation of their characteristics. A great amount of research devoted to diagnostics of plate-like structures considers specimens with constant thickness, which significantly facilities the diagnostic process. In such a case the velocity is also assumed to be constant. However, the developed diagnostic methods should be applicable, especially for the structures exposed to an aggressive environment, excessive load, or unfavorable weather conditions, etc., when the probability of damage occurring is much higher. In such cases, the assumption about the uniform thickness alongside the propagation path cannot be applied in every case. Thus, the present study is focused on wave propagation in metallic plates with variable thickness. The results of theoretical, numerical and experimental investigations of antisymmetric Lamb mode propagation in aluminum plates with a sine-shaped surface are presented. In the first step, the influence of non-uniform thickness distribution on wave velocity has been described. Next, the inverse problem aimed at shape reconstruction based on time of flight (ToF) analysis and spatially varying wave velocity was solved and compared with the standard dispersion curve-fitting method.

2

Aplication of guided wave propagation in diagnostics of steel bridge components

Rucka M., Zima B., Kędra R.

Archives of Civil Engineering

|

2014

|

Vol. 60, nr 4

493--515

EN

Early detection of potential defects and identification of their location are necessary to ensure safe, reliable and long-term use of engineering structures. Non-destructive diagnostic tests based on guided wave propagation are becoming more popular because of the possibility to inspect large areas during a single measurement with a small number of sensors. The aim of this study is the application of guided wave propagation in non-destructive diagnostics of steel bridges. The paper contains results of numerical analyses for a typical railway bridge. The ability of damage detection using guided Lamb waves was demonstrated on the example of a part of a plate girder as well as a bolted connection. In addition, laboratory tests were performed to investigate the practical application of wave propagation for a steel plate and a prestressed bolted joint.

3

Field experience of using guided waves for corrosion monitoring of piping

Niederhauser S., Ernst R.

Przegląd Spawalnictwa

|

2013

|

R. 85, nr 12

114--116

EN

DEKRA Industrial AB has used Guided Waves Ultrasonic Technique (hereafter called GWUT) for some years now. During time, DEKRA has acquired a lot of field experience with this technique and together with customers tried to find the limits of the technique. This article gives an overview on the technique and shows some results from field testing. Nonetheless of the experience acquired, DEKRA and its customers are still trying to find new possibilities for using the technique and find new areas to employ it.

PL

DEKRA Industrial AB już od kilku lat stosuje technikę ultradźwiękową fal kierowanych (dalej nazywaną GWUT). Podczas tego okresu DEKRA zdobyła wiele praktycznych doświadczeń w stosowaniu tej techniki oraz wraz z klientami próbuje znaleźć jej graniczenia. Niniejszy artykuł stanowi zwięzły opis podstaw techniki GWUT i prezentację wybranych wyników badań w terenie. Niezależnie od zdobytych już doświadczeń DEKRA wspólnie z klientami wciąż próbuje znaleźć nowe możliwości i obszary zastosowania tej techniki.