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Predicting the J integral fracture toughness of Al 6061 using the small punch test

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The 6000 series aluminium alloys (Al–Mg–Si systems) are commonly used as medium-strength structural materials; in particular, the 6061 (Al–1Mg–0.6Si) alloy is widely utilized as a general-purpose structural material due to its excellent formability and corrosion-resisting capabilities. The objective of this study was to obtain a correlation between the small punch (SP) test estimated equivalent fracture strain (qf) and fracture toughness (J1C) property for 6061 aluminium, and determine its viability as a non-destructive fracture toughness test technique for remaining life assessment of in-service components. Samples of 6061-T6 aluminium were cut from bulk plate, in both the longitudinal and transverse directions, for the as-received condition as well as subjected to three different over-ageing heat-treatment schedules. A strong linear correlation between valid J1C and SP estimated biaxial fracture strain qf is presented for aluminium 6061 at room temperature.
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Keywords: J integral fracture toughness; aluminium alloy 6061; equivalent fracture strain; in-service component; remaining life assessment; small punch test

Document Type: Research Article

Affiliations: 1: Department of Chemistry, Materials and Forensic Science, University of Technology, Sydney, PO Box 123, Broadway, NSW 2007, Australia 2: Institute of Materials and Engineering Science, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia 3: School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia

Publication date: 2007-09-01

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