Abstract
This chapter describes the fracture mechanics in Australia. Recent publications concerning fracture mechanics in Australia include the 4th Tweksbury Symposium on Fracture and the 1977 and 1980 Conferences of the Australian Fracture Group. During the period 1977–81, the Aeronautical Research Laboratories (ARL) has made major advances in the development of bonded repairs to cracked aircraft components. This procedure has been successfully used to repair stress-corrosion cracks in the wing of Hercules aircraft and in the crew module of Fill aircraft, as well as fatigue cracks in the landing wheels of Macchi aircraft and in the lower wing skin of Mirage III aircraft in service with the RAAP. Studies of the relationship between crack velocity, K, and stress-intensity factor, K, for sustained-load cracking of high-strength, tempered-martensitic (D6ac) steel in gaseous hydrogen and liquid mercury environments are being undertaken at ARL. The majority of work on fatigue is concerned with the investigation of service failures. Tests using double-cantilever-beam specimens have been carried out for various coatings that have been sprayed onto grit-blasted mild steel substrates at Monash. The toughness of zirconia has been increased by additions of calcia, magnesia, and yttrium, inducing a localized compressive zone at crack tips.
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