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Thursday, September 25, 2008: 9:30 AM
Room C (Palazzo dei Congressi di Stresa)
Mechanical vibration isolation in several industrial sectors such as electronic, aeronautic, transport, for instance, is necessary in order to improve the quality in new engineering applications and reduce the environment acoustic pollution.
Shape memory alloys (SMA) exhibit high damping capacity as well as good mechanical properties in a wide temperature range and can be used as passive dampers to replace the traditionally used polymeric materials, which present poor stiffness and are not stable enough for some structural applications even at relative low temperatures.
In this work a new kind of metal matrix composite, based on Cu-Al-Ni SMA powders, has been developed. The damping capacity of these composites has been studied by mechanical spectroscopy as a function of temperature, frequency and strain amplitude. The influence of thermal treatments on the thermo-elastic martensitic transformation as well as on the relative contribution from SMA particles and matrices, have been analyzed. High damping values, above η=0.1, are obtained in wide ranges of temperature and frequencies suggesting a high potential for practical applications.
The possibility of designing high damping materials in a broad temperature range, through the composition of SMA powders, open new possibilities and gives to these composites a great capacity and versatility for designing specific damping applications.
Shape memory alloys (SMA) exhibit high damping capacity as well as good mechanical properties in a wide temperature range and can be used as passive dampers to replace the traditionally used polymeric materials, which present poor stiffness and are not stable enough for some structural applications even at relative low temperatures.
In this work a new kind of metal matrix composite, based on Cu-Al-Ni SMA powders, has been developed. The damping capacity of these composites has been studied by mechanical spectroscopy as a function of temperature, frequency and strain amplitude. The influence of thermal treatments on the thermo-elastic martensitic transformation as well as on the relative contribution from SMA particles and matrices, have been analyzed. High damping values, above η=0.1, are obtained in wide ranges of temperature and frequencies suggesting a high potential for practical applications.
The possibility of designing high damping materials in a broad temperature range, through the composition of SMA powders, open new possibilities and gives to these composites a great capacity and versatility for designing specific damping applications.