Fatigue Failure Assessment of Metallic Specimens Using the Acoustic Emission Technique
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Mazian Mohammad
Abstract
This paper presents a process to determine the relationship between acoustic emission (AE) signals and the strain signal pattern for estimating material fatigue life. In addition, it establishes the usefulness of AE in predicting the fatigue life of metallic components. This study was carried out to investigate the relationship between the strain and AE signals to ensure that AE can also be used as a tool to predict the fatigue life of metallic specimens. Two types of sensors, i. e., the AE piezoelectric transducer and the strain gauge, were attached to SAE 1045 steel specimens during the fatigue cyclic test when the specimens were under constant loading. Two types of signals were obtained at three different applied loads (6.0 kN, 6.4 kN and 6.8 kN). Both signal types were then analyzed using a statistical model, and the results were used to correlate the fatigue life and AE signals. The fatigue life values were calculated using strain-life models. The correlation between the experimental and predicted values of fatigue life was then established. The results showed that the correlation between the r.m.s. AE values and the calculated fatigue life ranged from 74.0 % to 98.5 %, while the correlation between the kurtosis AE values and the predicted values was found to be between 95.0 % and 99.9 %. These correlation values showed that the AE technique can be used to predict the fatigue life of metallic specimens.
Abstract
Im vorliegenden Beitrag wird eine Methode zur Bestimmung der Zusammenhänge zwischen Schallemissionssignalen und Dehnungsignalen zur Abschätzung der Lebensdauer bei Ermüdungsbeanspruchung vorgestellt. Außerdem wird die Nützlichkeit der Schallemissionsanalyse zur Vorhersage der Ermüdungsfestigkeit und der Lebensdauer von metallischen Komponenten gezeigt. Die diesem Beitrag zugrunde liegende Studie wurde durchgeführt, um das Verhältnis zwischen der Dehnung und den Schallemissionssignalen zu untersuchen, um sicherzustellen, dass die Schallemissionsanalyse auch als Werkzeug zur Vorhersage der Lebensdauer von metallischen Komponenten verwendet werden kann. Dabei wurden während des Ermüdungsversuches zwei Sensortypen, zum einen der piezoelektrische Schallemissionstransducer und zum anderen der Dehnungsmessstreifen an einer Probe des Stahles SAE 1045 angebracht, wobei die Proben konstant beansprucht wurden. Es wurden zwei Signalarten bei drei verschiedenen Beanspruchungen (6,0 kN, 6,4 kN und 6,8 kN) aufgezeichnet. Beide Signaltypen wurden danach mittels eines statistischen Modells analysiert und die Ergebnisse wurden zur Korrelation der Lebensdauer mit den Schallemissionsdaten verwendet. Die Lebensdauerwerte wurden mittels dehnungsbasierter Modelle berechnet. Danach wurde eine Korrelation zwischen den experimentellen und den berechneten Werten erstellt. Die Ergebnisse zeigten, dass die Übereinstimmung der r.m.s. Schallemissionswerte mit der berechneten Lebensdauer zwischen 74,0 % und 98,5 % schwankte, während die Übereinstimmung der Kurtosis der Schallemissionsanalyse mit den Berechnungswerten zwischen 95,0 % und 99,9 % lag. Diese Korrelationswerte zeigten, dass die Schallemissionsanalyse zur Vorhersage der Lebensdauer von metallischen Proben verwendet werden kann.
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- Direct Decomposition of N2O Emitted from Nitric Acid Plant Tail Gases Using Noble Metal Supported Mordenite-Zeolite Catalysts∗
- Fatigue Failure Assessment of Metallic Specimens Using the Acoustic Emission Technique
- Vorschau/Preview
- Vorschau
- Kalender/Calendar
- Kalender
Articles in the same Issue
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Human Factors Perspective on the Reliability of NDT in Nuclear Applications
- Einsatz der Bayes'schen Statistik in der Zuverlässigkeitsbestimmung von zerstörungsfreien Prüfsystemen
- Paradigm Shift in the Holistic Evaluation of the Reliability of NDE Systems
- Safe product design – the role of the NDT reliability analysis
- Einfluss der Verformungsgeschwindigkeit und des Feuchtegehaltes auf das quasistatische Verformungsverhalten technischer Vulkanfiber∗
- Experimental Study of Imida zoline as an Inhibitor of Carbon Steel in Acid Media
- Wear Behaviour of Heat Treated 100Cr6 Steels
- Effects of Surface Treatment on Corrosion Resistance of 316 Stainless Steel Implants in Tyrode Solution
- Fabrication and Characterization of Bimetallic Mordenite-Zeolite Catalysts for Low Temperature Direct Decomposition of N2O Emitted from Nitric Acid Plants∗
- Direct Decomposition of N2O Emitted from Nitric Acid Plant Tail Gases Using Noble Metal Supported Mordenite-Zeolite Catalysts∗
- Fatigue Failure Assessment of Metallic Specimens Using the Acoustic Emission Technique
- Vorschau/Preview
- Vorschau
- Kalender/Calendar
- Kalender