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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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Pollack Periodica
Authors: Themistoklis Nikolaidis, Athanasios Michalopoulos, George Stavroulakis, and Charalampos Baniotopoulos

Michalopoulos A., Stavroulakis G., Zacharenakis E., Panagiotopoulos P. D. A pre-stressed tendon based passive control system for bridges, Computers and Structures , Vol. 63, No. 6, 1997, pp. 1165

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In the field of the seismic protection of buildings, shear panels represent an effective passive control system. In this framework a wide experimental and numerical program has been carried out at the University of Naples aiming at evaluating the performance of stiffened pure aluminum shear panels. Experimental cyclic tests on two 1000x1500 mm panels, characterized by different stiffeners configuration, have been performed. To simulate the systems behavior, according to the experimental tests, refined FEM models have been set-up. The comparison among results shows that the proposed models are able to interpret the systems behavior in terms of their main features.

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.M., Panico S. Pure aluminum shear panels as passive control system for seismic protection of steel moment resisting frames, Proceedings of the IV. International Conference STESSA’ 03 (Behavior of Steel Structures in Seismic Areas), Balkema, 609

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such as increasing the factors of safety or absorbing the impact forces [ 1–2 ]. They can be categorized into passive and active mechanical elements, the passive control mechanical elements are represented by springs and dampers parts while active

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also be kept less than L / 600 where L is the length of the bridge in m . To satisfy these criteria, adding passive control through calibrated dampers is performed below. Fig. 2 gives the acceleration as function of the HSLM-A train speed for

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conducting more passive control wait-list control trials of psychotherapeutic interventions for CBD (more use of active treatment controls is indicated) and conversely the need for more double-blind placebo-controlled trials in pharmacological treatment

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