Observation of the fatigue crack propagation rate of an aluminum alloy specimen under fatigue spectrum loadings

Shahrum Abdullah, Kamarul Ariffin Zakaria, Mariyam Jameelah Ghazali

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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-tolow and low-to-high sequence loadings. All three have been performed with the A16061-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.

Original languageEnglish
Pages (from-to)663-673
Number of pages11
JournalMaterialpruefung/Materials Testing
Volume54
Issue number10
Publication statusPublished - 2012

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Fatigue crack propagation
Aluminum alloys
Fractography
Fatigue of materials
Fatigue testing
Plasticity
Crack propagation
Hydraulics

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

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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-tolow and low-to-high sequence loadings. All three have been performed with the A16061-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.",
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AU - Zakaria, Kamarul Ariffin

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N2 - 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-tolow and low-to-high sequence loadings. All three have been performed with the A16061-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.

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