Shape memory alloys, or SMAs, possess the ability to return to their original shape after being severely deformed, either spontaneously or following the application of heat.
This makes them useful materials, not just for making spectacle frames but also for technical applications such as thermostats, stents and micro-actuators. Other applications in the construction industry are conceivable too, for example in the reinforcement of bridges.
If a concrete beam is cast with reinforcing rods made of an SMA material, these can then be “activated” through the application of heat. They attempt to return to their original shape, but because of their concrete sheath they cannot do so, thus exerting a pre-stressing force on the beam. This effect can be used, for example, to pre-stress a complete bridge span. In order to generate the necessary force the SMA rods must simply be heated by passing an electric current through them. This obviates the need for using elaborate tensioning systems and jacket tubes, as used in conventional pre-stressing techniques.
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The Latest on: Shape-memory alloy
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The Latest on: Shape-memory alloy
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Starting from the basic principles of the martensitic transformation, on which the shape memory effect and the superelasticity of alloys are based, the mechanisms of the two phenomena are clearly ...
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Shape Memory Alloys (SMAs) are unique materials that exhibit shape memory behavior, which is exemplified by the ability recover large deformations due to changes in external loading conditions, ...
- Shape-Memory Alloys Handbookon August 1, 2017 at 5:55 am
These two key elements enable the author to introduce the main features associated with the behavior of shape-memory alloys (SMAs), i.e. the one-way shape-memory effect, pseudo-elasticity, training ...
- Breathing Walls With Shape Memory Alloy Wireon October 3, 2007 at 12:38 pm
When you need something quietly bending or moving, don’t underestimate SMA’s (or Shape Memory Alloys). The Living Glass project by architects [David Benjamin] and [Soo-in Yang] catalogs an ...
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