Schadensdetektion mithilfe elektromechanischer Impedanzspektren

Sahm, Daniel; Pak, Daniel; Fritzen, Claus‐Peter; Dreisbach, Anna‐Lena; Dietrich, Gerhard; Yokaribas, Volkan

doi:10.1002/stab.201900118

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…This section contains an overview of similarities and differences with the work of Sahm et al 29 regarding the investigation of bolts used in rail supports. Afterwards, the proposed approach for the damage indicator DI Y ~ true¯ is compared to the commonly used correlation coefficient deviation (CCD) indicator and the root mean square deviation (RMSD) indicator.…”

Section: Discussionmentioning

confidence: 98%

“…Finally, estimates are made on the sensitivity of the method. Just as in this work, Sahm et al 29 investigated the monitoring of bolts used in rail supports by observing EMA spectra. Their study consists of preliminary investigations of the effects of varying temperature, varying pretension of the bolt, cuts in the bolt as well as fatigue cracks on the EMA spectra in general.…”

Section: Discussionmentioning

confidence: 99%

“…As failure of these components can even cause train derailment, an approach to detect fatigue cracks is the purpose of this work. Sahm et al 29 have also investigated these elements and figured out that damage detection by employing the EMI method on these real-life structures is possible.…”

Section: Introductionmentioning

confidence: 99%

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A novel data-based approach for monitoring fatigue crack propagation in welded joints under varying ambient temperature using the electromechanical admittance

Dreisbach

Yokaribas

Dietrich

et al. 2023

Structural Health Monitoring

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Fatigue crack growth is one of the most common damage mechanisms of structural components and can result in a sudden and unexpected abrupt fracture which can cause catastrophic failure. Thus, monitoring of crack propagation is an important topic of structural health monitoring. For that reason, this work aims at the detection of crack propagation by the application of a high-frequency vibration-based method, using the electromechanical admittance (EMA). It enables the local monitoring of the coupled dynamic behavior of the structure and the piezoelectric transducer which changes, for example, due to damage. It is the purpose of this study to develop a method from the recorded data reflecting fatigue crack growth in weld zones. As it is known that the data are affected by temperature, a temperature compensation strategy is considered. In this study, a presentation of the coupled EMA data has been found, which allows the isolation of the crack propagation effects. Within the scope of fatigue experiments, fatigue cracks were introduced into threaded bolts of rail support points, welded onto base plates. In practice, they are embedded in a layer of mortar and, therefore, have poor accessibility. Electromechanical impedance measurements were carried out at different states of fatigue crack growth. The fatigue crack growth was validated by strain gauge measurements executed during the fatigue experiment. The proposed feature was calculated from the recorded EMA data. The technique produces promising results detecting fatigue cracks and can also be transferred to similar types of welded joints or rods where fatigue crack growth occurs.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

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A novel data-based approach for monitoring fatigue crack propagation in welded joints under varying ambient temperature using the electromechanical admittance

Dreisbach

Yokaribas

Dietrich

et al. 2023

Structural Health Monitoring

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“…Lokale Verfahren hingegen basieren oft auf der Ausbreitung von Ultraschall und zeichnen sich durch ein höheres Auflösungsvermögen aus, was eine präzisere Lokalisierung von Schäden ermöglicht [22]. Hierzu zählen u. a. die Schadensdetektion mittels geführter Wellen (Guided Waves) [25][26][27][28][29][30] und die Schadensdetektion mittels elektromechanischer Impedanzen (EMI) [31][32][33][34][35][36][37]. Z s ω ð Þ der Struktur wider.…”

Section: Methoden Zur Detektion Von Korrosionunclassified

Untersuchung zur Detektion von Oberflächenkorrosion an Schrauben mithilfe von piezoelektrischen Wandlern

Sahm,

Pak

2024

Stahlbau

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Die Studie untersucht die Anwendbarkeit von piezoelektrischen Wandlern zur zerstörungsfreien Detektion von Oberflächenkorrosion an Schrauben. Grundlage dieser Methode ist die Messung elektromechanischer Impedanzspektren, die sich infolge variierender Strukturzustände verändern und grundsätzlich eine Bewertung des Strukturzustands ermöglichen. Im Rahmen der Studie wurden zur Eignungsprüfung experimentelle und numerische Untersuchungen an vier HV‐Schraubengrößen nach DIN EN 14399‐4 durchgeführt. Es konnte ein Zusammenhang zwischen der Verschiebung der Resonanzamplitude der Schrauben und dem Korrosionsgrad hergestellt werden. Weiterhin wurde ein annähernd linearer Trend zwischen der Änderung des Schaftquerschnitts und der Verschiebung der Resonanzamplitude beobachtet. Darüber hinaus konnte die Entwicklung der Impedanzspektren erfolgreich durch eine numerische Simulation reproduziert werden. Die Ergebnisse der Studie zeigen einen vielversprechenden Ansatz für eine automatisierte und kosteneffiziente Überwachung der Oberflächenkorrosion von Schrauben. Die Integration dieser Technologie könnte in verschiedenen Anwendungsbereichen zu erheblichen Kosteneinsparungen und erhöhter Sicherheit führen, insbesondere bei der Überwachung schwer zugänglicher, korrosionsgefährdeter Bereiche.

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“…In addition to the longitudinal and radial modes there are other modes which, however, cause a lower system response in the present case and are therefore not used for evaluation. Investigations have shown that many modes are located in the frequency range bigger/greater than 100 kHz [8]. A determination of the spectrum was made by looking at the individual modes, whereby significant longitudinal and radial modes of the structure are located in the range between 130 kHz and 150 kHz.…”

Section: Definition Of Frequency Sweep Rangementioning

confidence: 99%

Non‐destructive damage detection on welded threaded bolts based on electromechanical impedance spectra

Sahm¹,

Pak²,

Fritzen³

et al. 2021

ce papers

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Within a research project carried out at the Department of Civil Engineering and the Department of Mechanical Engineering of the University of Siegen, a new monitoring method for non‐destructive damage detection on bolts was developed and tested according to its applicability on real life structures. The so‐called EMI‐method is based on the measurement of electromechanical impedance spectra, which change with varying structural states and thus allow for a condition assessment. Structures vibrate in a combination of their natural modes, which can provide information about their structural condition. Their modal characteristics are system‐inherent quantities and are governed by geometry, system stiffnesses and mass allocation. If a system parameter changes, e.g. the bending stiffness of a bridge, this is reflected in the vibration analysis and the modal characteristics. To identify the modal characteristics of civil engineering structures, these are excited and the system response is measured. This principle is also used for damage detection by means of electro‐mechanical impedance spectra (EMI). The observed system‐inherent quantity is the frequency‐dependent mechanical impedance Zs(ω) of the structure. The method is based on the idea that the mechanical impedance of a structure or component to be measured changes as a result of damage (or loss of prestress in the case of bolts) and thus these changes can be detected. In the project, investigations were carried out on steel plates with orthogonally welded threaded bolts, which are used, for example, as fasteners for rail supporting points on bridges. Research objectives were on one hand the detection of the prestress stage and on the other hand the detection of fatigue damage in the weld seam. Within the scope of the project, it has been investigated to what extent a change of the prestressing load can be reliably detected by means of the EMI method. Furthermore, the influence of damage to the bolt on the impedance spectra was investigated.

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Schadensdetektion mithilfe elektromechanischer Impedanzspektren

Cited by 6 publications

References 7 publications

A novel data-based approach for monitoring fatigue crack propagation in welded joints under varying ambient temperature using the electromechanical admittance

A novel data-based approach for monitoring fatigue crack propagation in welded joints under varying ambient temperature using the electromechanical admittance

Untersuchung zur Detektion von Oberflächenkorrosion an Schrauben mithilfe von piezoelektrischen Wandlern

Non‐destructive damage detection on welded threaded bolts based on electromechanical impedance spectra

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