Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Building dampers by SMA CuAlBe: Long time guarantee and conditioning treatments
The mechanical properties of Shape Memory Alloys (SMA) make them attractive for damping devices. The ability to support a large, recoverable strain and the presence of a considerable hysteresis are important parameters. The limits of behaviour, the operating temperatures and the fatigue life are also parameters of interest. This work is centred on the long time guarantee and on the conditioning treatments of the alloy. These effects are included in a model describing the thermomechanical behaviour of SMA, enabling simulations of performance of damping devices in a structure subjected to external accelerations from earthquakes. The results suggest the appropriateness of a CuAlBe alloy for dampers. A detailed study of the macroscopic properties and of the microscopic effects (after quench, coexistence and atomic diffusion effects) establishes the conditions for the working space of CuAlBe alloys be inside the pseudoelastic window and allow the material to be used for dampers in civil engineering. The local model of the transformation and deformation, and an appropriate identification of physical parameters allows to analyze the behavior under variable thermodynamic forces. Then it becomes possible the computation of the effect of dampers realized with SMA on a structure behavior under the external accelerations of a quake to check for the performances of the SMA devices.
Building dampers by SMA CuAlBe: Long time guarantee and conditioning treatments
The mechanical properties of Shape Memory Alloys (SMA) make them attractive for damping devices. The ability to support a large, recoverable strain and the presence of a considerable hysteresis are important parameters. The limits of behaviour, the operating temperatures and the fatigue life are also parameters of interest. This work is centred on the long time guarantee and on the conditioning treatments of the alloy. These effects are included in a model describing the thermomechanical behaviour of SMA, enabling simulations of performance of damping devices in a structure subjected to external accelerations from earthquakes. The results suggest the appropriateness of a CuAlBe alloy for dampers. A detailed study of the macroscopic properties and of the microscopic effects (after quench, coexistence and atomic diffusion effects) establishes the conditions for the working space of CuAlBe alloys be inside the pseudoelastic window and allow the material to be used for dampers in civil engineering. The local model of the transformation and deformation, and an appropriate identification of physical parameters allows to analyze the behavior under variable thermodynamic forces. Then it becomes possible the computation of the effect of dampers realized with SMA on a structure behavior under the external accelerations of a quake to check for the performances of the SMA devices.
Building dampers by SMA CuAlBe: Long time guarantee and conditioning treatments
Gebäudedämpfer aus CuAlBe-Formgedächtnislegierungen: Langzeitgarantie und Konditionierungsbehandlung
Isalgue, A. (Autor:in) / Martorell, F. (Autor:in) / Torra, V. (Autor:in) / Lovey, F.C. (Autor:in)
2004
4 Seiten, 6 Bilder, 1 Tabelle, 3 Quellen
Aufsatz (Konferenz)
Englisch
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