Internal-friction mapping on solids by resonance ultrasound microscopy
Internal-friction mapping on solids by resonance ultrasound microscopy
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DOI：
10.1063/1.2194479
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发表时间：
2006-04-03
影响因子：
4
通讯作者：
Hirao, M
中科院分区：
文献类型：
--
作者：
Ogi, H;Niho, H;Hirao, M
发展了一种内耗显微镜，通过测量与材料接触的孤立的Langasite振荡点的振动衰减来定量测定局部表面上的材料阻尼。振荡器纵向振动的共振频率和衰减系数的非接触式测量是用线天线实现的，对局部接触区的模数和衰减系数具有很高的灵敏度。利用广义赫兹接触模型，建立了材料的局部内耗与谐振器系统衰减之间的关系式。文中给出了双相不锈钢和铜/NbTi复合材料的实验结果。
An internal-friction microscopy is developed for quantitatively determining material damping on a local surface area by measuring vibrational attenuation of an isolated langasite oscillator point contacting the material. Noncontacting measurement of the resonance frequency and attenuation coefficient of the longitudinal vibration of the oscillator has been achieved with a line antenna, providing high sensitivity to the modulus and damping in the local contacting area. Formulation of the relationship between a material's local internal friction and attenuation of the resonator system is proposed using the generalized Hertzian-contact model. Results on a dual-phase stainless steel and a Cu/NbTi composite are shown.