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Metastable effects onmartensitic transformation in SMA

Part 4. Thermomechanical properties of CuAlBe and NiTi observations for dampers in family houses

Journal of Thermal Analysis and Calorimetry
Authors: C. Auguet, A. Isalgué, F. Lovey, F. Martorell, and V. Torra

Abstract  

The behavior of shape memory alloys (SMA) allows their use as a passive smart material. In particular, the existence of a hysteretic cycle in the domain of the elementary coordinates strain-stress-temperature (σ, ε, T) suggests its application for damping in mechanical and/or in civil engineering. We are working in the application of SMA as dampers for earthquakes in small houses as family homes. For dampers installed in the inner porticos of the house, the suggested SMA is the CuAlBe and, eventually, the NiTi. At room temperature the used SMA wires induces forces situated between 2–3kN/wire. The properties related with the damping applications for CuAlBe and NiTi, i.e., the SMA creep and the self-heating will be presented, together with some other minor stress and temperature effects on NiTi modifying the hysteretic behavior.

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Abstract  

The fatigue-life (traction-traction only) is experimentally studied mainly for pseudoelastic NiTi wire of 2.46 mm of diameter for eventual application in damping of structures under wind or rain. Thermal effects are highly relevant in determining the fatigue-life. The results shows that the fracture level overcomes 130000 cycles when the moving air is used for cooling. When the number of working cycles overcomes 30000, the frictional energy decreases 40% vs. N roughly with an exponential behavior.

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Introduction Shape memory alloys (SMA) are metallic materials that undergo thermoelastic martensitic phase transformation which demonstrates their ability to return to some previously defined shape when subjected to an

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phase transformation of nanocrystalline tetragonal zirconia powders . J Eur Ceram Soc 2010 30 : 2749 – 2755 10.1016/j.jeurceramsoc.2010.05.025 . 34. Ownby , PD , Burt , DD , Stewart

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.jct.2005.05.002 . 34. Skovgaard , M , Ahniyaz , A , Sørensen , BF , Almdal , K A van Lelieveld 2010 . Effect of microscale shear stresses on the martensitic phase transformation of

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