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Experimental Investigations on the Nano-Damping Durability

[+] Author Affiliations
Claudiu Valentin Suciu

Fukuoka Institute of Technology, Fukuoka, Japan

Paper No. MicroNano2008-70018, pp. 7-15; 9 pages
doi:10.1115/MicroNano2008-70018
From:
  • 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems
  • 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems
  • Clear Water Bay, Kowloon, Hong Kong, June 3–5, 2008
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4294-0 | eISBN: 0-7918-3819-6
  • Copyright © 2008 by ASME

abstract

Connected to the nano-technological development, solid-liquid interfaces have been used to dissipate surface energies, in systems where the solid is liquid-repellent. Such interfaces are able to store, release or transform the mechanical energy. For instance, some modified silicas and zeolites in association with water have been used to build efficient ecological dampers and springs. Regarding this attractive kind of storage and loss of energy, some practical aspects, such as the endurance limits need to be clarified, and measures to augment the nano-damping durability to values required by usual machine elements (106 −107 working cycles) await validation. Thus, in this work endurance tests are performed on nano-porous silica gel micro-particles by using a compression-decompression chamber. When the colloidal mixture of water and silica gel was supplied directly into the test chamber, the nano-damping performances abruptly reduced at augmentation of the number of working cycles due to the colloid leakage at the seals. Such severe leakage occurred since the clearance between the piston and cylinder (hundreds of microns), prescribed by the seals makers, was one order of magnitude larger than the diameter of silica gel particles (tens of microns); accordingly, a few layers of silica gel penetrated the gap, producing damage by abrasive wear of the seals and even of the piston surface during about 105 working cycles. In order to augment the nano-damping durability, colloidal mixture of water and silica gel is introduced inside of a tank that is separated by micro-filters from the main cylinder, in which only water is supplied. One discusses the influence of filtration on the nano-damping performances and the variation of durability versus the ratio of the filter pore’s diameter to the mean size of the silica gel particles. During a few working cycles the silica gel grains are not damaged, since the uniform pressure distribution in the liquid surrounding the particles prevent them from premature fracture, even at high-pressurization. However, silica gel grains that undergo gradually fatigue fracture are able to pass the filter and then, to escape at the test chamber seals; this produces a continuous reduction of the silica gel quantity inside of the pressurization chamber and accordingly, a proportional reduction of dissipation. On a logarithmic scale, a slight linear decreasing of the damping occurs until a critical number of working cycles; this is followed by an abrupt linear reduction of dissipation, with a slope that decreases when the diameter of the filter orifices is diminished. Despite the undesired decreasing of the nano-damping performances at augmentation of the number of working cycles, using appropriate filters the durability can be extended to reach the required life of an actual machine element.

Copyright © 2008 by ASME
Topics: Damping , Durability

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