Synthetic and nature-based materials paper
Abdy, A, Sadiq, H & Al-Mahaidi, R 2014, 'Effect of heat treatment on the recovery stresses generated by super-elastic NiTi shape memory alloy wires', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. I, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 211-216. ISBN: 9780994152008.
This paper presents a study of the effect of heat treatment on the maximum and minimum recovery stresses generated by super-elastic SMA wires. The experimental work involved subjecting raw SMA wires to different heat-treatment temperatures using a muffle furnace immediately followed by water quenching. Recovery stress tests were then conducted on the pre-strained heat-treated SMA wires using a 50 kN tensile machine to determine the maximum and minimum recovery stresses generated by the SMA wires. The experimental work also included conducting tensile tests on the SMA wires using a 100 kN tensile machine to determine their mechanical properties. The findings of this study indicate that the maximum recovery stresses produced by heat-treated SMA wires increase with increasing heat treatment temperature, while the minimum recovery stresses (residual stresses) produced by heat-treated SMA wires increase with increasing heat treatment temperature up to 350oC, then decrease at 400oC. The recovery stresses generated by NiTi SMA wires can be used to provide pre-stressing or confinement in concrete and steel structures.