Sun, 20 Jul 2008 14:47:37 BST CiteULike: norris thermoelasticity http://www.citeulike.org/user/norris/tag/thermoelasticity CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/norris/article/2740859 <i>Journal of Physics: Conference Series 92 (2007)</i> Surface induced phonon decay rates in thin film nano-structures Douglas Photiadis Journal of Physics: Conference Series 92 (2007) 2008-04-30T21:08:51-00:00 2007 Journal of Physics: Conference Series 92 thermoelasticity http://www.citeulike.org/user/norris/article/328346 <i>Materials Science, Vol. 41, No. 1. (January 2005), pp. 74-81.</i> Equations of the Dynamic Problem of Thermoelasticity in Stresses in a Three-Orthogonal Coordinate System R Musii H Stasyuk doi:10.1007/s11003-005-0134-6 Materials Science, Vol. 41, No. 1. (January 2005), pp. 74-81. 2005-09-21T13:29:27-00:00 2005 Materials Science 1068-820X 41 1 74 81 Kluwer Academic Publishers thermoelasticity http://www.citeulike.org/user/norris/article/873557 <i>Applied Physics Letters, Vol. 29, No. 9. (1976), pp. 529-530.</i><br /><br />Within the framework of classical beam theory it is shown that a strain-independent surface stress has no effect on the natural frequency of a thin cantilever beam. Therefore, the experimental results of Lagowski, Gatos, and Sproles must have a different explanation. Applied Physics Letters is copyrighted by The American Institute of Physics. doi:10.1063/1.89173 PACS: 68.35.+q, 44.30.Ea, 43.40.+s        Additional Information Full Text:  [  PDF (136 kB) Effect of surface stress on the natural frequency of thin crystals ME Gurtin X Markenscoff RN Thurston doi:10.1063/1.89173 Applied Physics Letters, Vol. 29, No. 9. (1976), pp. 529-530. 2006-09-26T13:17:56-00:00 1976 Applied Physics Letters 29 9 529 530 AIP damping phonons thermoelasticity http://www.citeulike.org/user/norris/article/699273 <i>Applied Physics Letters, Vol. 86, No. 18. (2005)</i><br /><br />The temperature dependence (15–320  K) of the acoustic dissipation was studied for some lower vibrational modes of a suspended silicon plate 1.5  µm thick. Our oscillator was exposed to the laboratory environment prior to measurement, laser annealed while in a cryogenic vacuum, and remeasured. We find a dissipation peak at 160  K, similar to results by others, and a second dissipation peak near 30  K. Annealing reduced the dissipation at 160  K by as much as a factor of 10, and gave quality factors as high as 1.4×106 at 470  kHz and our lowest temperature. Our data support the idea that the 160  K peak is related to adsorbates, and show this mechanism is important at room temperature. Post-anneal room-temperature dissipation appears to be limited by thermoelastic loss for certain modes. Effects of annealing and temperature on acoustic dissipation in a micromechanical silicon oscillator Hans Haucke Xiao Liu JF Vignola BH Houston MH Marcus JW Baldwin doi:10.1063/1.1921354 Applied Physics Letters, Vol. 86, No. 18. (2005) 2006-06-17T15:00:50-00:00 2005 Applied Physics Letters 86 18 AIP damping plates thermoelasticity http://www.citeulike.org/user/norris/article/699272 <i>Applied Physics Letters, Vol. 87, No. 4. (2005)</i><br /><br />The influence of adsorbates on the surface-related mechanical dissipation of a silicon resonator was investigated. Different ion species were attached on a silicon resonator with a native oxide, and the quality factor (Q factor) and resonant frequency changes were observed by in situ measurement. It was found that water ion attachment creates OH terminations and results in a similar Q factor to that after exposure to the atmosphere. Nitrogen ions created very active sites for surface mechanical dissipation. In contrast, exposure to hydrogen ions increased the Q factor by a factor of 2. Hydrogen ions caused the dissipation sites on the surface to become inactive or less active for surface-related mechanical dissipation. ©2005 American Institute of Physics Effect of ion attachment on mechanical dissipation of a resonator Takahito Ono Masayoshi Esashi doi:10.1063/1.1993771 Applied Physics Letters, Vol. 87, No. 4. (2005) 2006-06-17T14:59:46-00:00 2005 Applied Physics Letters 87 4 AIP damping plates thermoelasticity http://www.citeulike.org/user/norris/article/699191 <i>Journal of Applied Physics, Vol. 97, No. 2. (2005)</i><br /><br />The room-temperature quality factors of silicon micromechanical oscillators have been investigated by scanning laser vibrometry. One of the flexural modes has very little attachment loss to its environment, which enables us to study internal loss mechanisms. After several consecutive annealing steps up to 800  °C, the quality factor Q has increased from 8×104 to 6.0×105. However, the Q decays to 1.4×105 over six months in air. We conclude that near-surface lattice defects caused by reactive-ion etching and surface adsorbates are the main source of internal loss while surface adsorbates are responsible for the time dependence. We also discuss the thermoelastic limit in terms of Zener's theory and flexural modal components of thin plates with vibratory volume change, and compare it with our results. A loss mechanism study of a very high Q silicon micromechanical oscillator Xiao Liu JF Vignola HJ Simpson BR Lemon BH Houston DM Photiadis doi:10.1063/1.1819980 Journal of Applied Physics, Vol. 97, No. 2. (2005) 2006-06-17T14:41:37-00:00 2005 Journal of Applied Physics 97 2 AIP damping plates thermoelasticity http://www.citeulike.org/user/norris/article/699180 <i>The Journal of the Acoustical Society of America, Vol. 109, No. 4. (2001), pp. 1422-1432.</i><br /><br />A time-domain formulation for the flexural vibrations in damped rectangular isotropic and orthotropic plates is developed, in order to investigate transient excitation of plates by means of sound synthesis. The model includes three basic mechanisms of damping (thermoelasticity, viscoelasticity and radiation) using a general differential operator. The four rigidity factors of the plate are modified by perturbation terms, each term corresponding to one specific damping mechanism. The first damping term is derived from the coupling between the thermoelastic stress–strain relations and the heat diffusion equation. The second term is obtained from the general differential formulation of viscoelasticity. The third term is obtained through a Padé approximation of the damping factor which governs the coupling of the plate with the surrounding air. The decay factors predicted by the model reproduce adequately the dependence on both dimensions and frequency of the decay factors measured on rectangular plates of various sizes and thicknesses made of four different materials (aluminum, glass, carbon fiber, and wood). The numerical resolution of the complete problem, including initial and boundary conditions, and the comparison between real and simulated sounds are presented in a companion paper [J. Acoust. Soc. Am. 109, 1433–1447 (2000)]. ©2001 Acoustical Society of America. Time-domain simulation of damped impacted plates. I. Theory and experiments Antoine Chaigne Christophe Lambourg doi:10.1121/1.1354200 The Journal of the Acoustical Society of America, Vol. 109, No. 4. (2001), pp. 1422-1432. 2006-06-17T12:35:15-00:00 2001 The Journal of the Acoustical Society of America 109 4 1422 1432 ASA damping plates thermoelasticity