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Shape memory alloys and offering superelastic property opportunity in reinforced concrete structures

Hosseini M., Beiranvand P., Dehestani A., Dehestani K.

Archives of Materials Science and Engineering

2017

Vol. 85, nr 1

5--13

Purpose: The effect of shape memory and super-elastic property are two exclusive features in shape memory alloys. To exploit the properties of shape memory effect, alloy needs to be heated, but super-elastic property in these alloys will be proposed automatically in case suitable conditions. Design/methodology/approach: In this study, with simulating short-square reinforced concrete column experimental model in software ANSYS and in multi-level and increasing process, longitudinal armatures with shape memory alloy material will replace steel armatures with super-elastic behavior will be investigated with making shape memory alloy kind as variable (copper and nickel-based alloys), the opportunity of super-elastic property emergence in these alloys and with playing the role of longitudinal armature in reinforced concrete column. Findings: It can generally be said that memory alloy will achieve to goal that its created stresses will be located among stress of beginning direct phase and stress of finishing direct phase and whatever these stresses are closer to finishing direct phase, alloy will have more efficiency to propose its super-elastic property. Research limitations/implications: In case of using shape memory alloys as longitudinal armatures in reinforced concrete structures considering them buried in concrete, exploitation of shape memory property will have its particular problems that these problems won’t happen about the super-elastic property. Considering the high rate of strain capacity (3 to 8%) in memory alloys with super-elastic behaviour and the limitation of this capacity in concrete, conditions are necessary to be prepared in a way that memory alloy has the opportunity to propose super-elastic property. Originality/value: Except shape memory alloy that has proposing super-elastic behaviour in concrete structures and is investigated in this study, other factors such as the rate of resistance characteristic of pressure of concrete and mechanical characteristics of steel armatures are effective in this case as well that can be good subjects for investigation.