Observation of the Fatigue Crack Propagation Rate of an Aluminum Alloy Specimen under Fatigue Spectrum Loadings
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Shahrum Abdullah
Abstract
This paper presents an assessment on fatigue crack propagation (FCG) behaviour and fractography observation of an aluminum alloy that was exposed under spectrum loadings. The FCG test has three types of cyclic loadings, namely, constant-amplitude loading (CAL) as well as high-to-low and low-to-high sequence loadings. All three have been performed with the Al6061-T6 specimens. The tests were performed using a 100 kN servo-hydraulic fatigue testing machine according to ASTM E647 standard. The results show that fatigue crack propagation and its fractography were influenced by the load interaction and the sequence, which affect the fracture behaviour of aluminum alloys. The fracture surface exhibited irregular local striation spacings under the spectrum loading. Moreover, the micrographs show increased plasticity throughout the crack propagation compared to CAL.
Kurzfassung
In dem vorliegenden Beitrag wird eine Abschätzung des Ermüdungsrissfortschrittes (fatigue crack propagation (FCG)) sowie fraktographische Beobachtungen für eine Aluminiumlegierung präsentiert, die Beanspruchungsspektren ausgesetzt war. Der FCG-Test beinhaltet drei dynamische Beanspruchungsarten, und zwar die Beanspruchung mit konstanter Amplitude sowie Beanspruchungssequenzen von niedriger zu hoher und von hoher zu niedriger Beanspruchung. Alle drei wurden mit Proben der Aluminiumlegierung Al6061-T6 durchgeführt. Die Prüfungen fanden mit einer 100 kN servohydraulischen Prüfmaschine entsprechend dem ASTM E647 Standard statt. Die Ergebnisse zeigen, dass der Ermüdungsrissfortschritt und die Fraktographie durch die Interaktion der Beanspruchungen und die Sequenz beeinflusst werden, die sich auf das Rissverhalten von Aluminiumlegierungen auswirken. Die Bruchoberfläche wies irreguläre lokale Abstände zwischen den Streifen bei der Beanspruchung mit Spektren auf. Darüber hinaus zeigten die Gefügeaufnahmen eine erhöhte Plastifizierung während des Rissfortschrittes im Vergleich zur Beanspruchung unter konstanter Amplitude auf.
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© 2012, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Experimenteller Betriebsfestigkeitsnachweis von Kurbelwellen: Vorstellung eines schädigungsäquivalenten Bauteilprüfkonzeptes
- Innovative Prüfmethodik zur Ermittlung der thermomechanischen Ermüdung an Zylinderköpfen
- Observation of the Fatigue Crack Propagation Rate of an Aluminum Alloy Specimen under Fatigue Spectrum Loadings
- The Effect of Plasma Arc Process Parameters on the Properties of Dissimilar AISI 1040/AISI 304 Steel Plate Welds
- Multi-Level Porosity Silver Foams by Powder Processing Method
- Microstructure and Mechanical Behaviour of Friction Welded AISI 2205/AISI 1040 Steel Joints
- Effect of Deep Cryogenic Treatment on Mechanical and Tribological Properties of PM S390 MC High-Speed Steel
- Residual Stress Analysis of Steel Fibre Reinforced Composite Inverted-Tooth Chains
- Microstructure and Mechanical Properties of Dual Matrix Aluminium-Fly Ash Composites Processed via Cryomilling, Cold Compaction and Hot Extrusion
- Glimmentladungsanalyse (GD-OES) buntgehärteter Stahloberflächen
- Tribological Properties of Sn-Pb Based SnPbAlZn Journal Bearings
- Kalender/Calendar
- Kalender
- Vorschau/Preview
- Vorschau
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Experimenteller Betriebsfestigkeitsnachweis von Kurbelwellen: Vorstellung eines schädigungsäquivalenten Bauteilprüfkonzeptes
- Innovative Prüfmethodik zur Ermittlung der thermomechanischen Ermüdung an Zylinderköpfen
- Observation of the Fatigue Crack Propagation Rate of an Aluminum Alloy Specimen under Fatigue Spectrum Loadings
- The Effect of Plasma Arc Process Parameters on the Properties of Dissimilar AISI 1040/AISI 304 Steel Plate Welds
- Multi-Level Porosity Silver Foams by Powder Processing Method
- Microstructure and Mechanical Behaviour of Friction Welded AISI 2205/AISI 1040 Steel Joints
- Effect of Deep Cryogenic Treatment on Mechanical and Tribological Properties of PM S390 MC High-Speed Steel
- Residual Stress Analysis of Steel Fibre Reinforced Composite Inverted-Tooth Chains
- Microstructure and Mechanical Properties of Dual Matrix Aluminium-Fly Ash Composites Processed via Cryomilling, Cold Compaction and Hot Extrusion
- Glimmentladungsanalyse (GD-OES) buntgehärteter Stahloberflächen
- Tribological Properties of Sn-Pb Based SnPbAlZn Journal Bearings
- Kalender/Calendar
- Kalender
- Vorschau/Preview
- Vorschau