23rd International Congress on Sound and Vibration, ICSV 2016
会议日期
July 10, 2016 - July 14, 2016
会议地点
Athens, Greece
摘要
As a structure size scales down to the order of a micron or smaller, there can be a significant changes in the mechanical properties as compared to its macroscopic ones. The nonlocal theories were developed to explain those changes, in which several material constants are involved. Those material constants are (assumed to be) related with the lattice length, grain size, inclusion and defects such as crack, dislocation and void, etc. However, there is still no a clear physical picture for those constants. Various experiments have been conducted to determine those material constants, which always use several specimens and often result in controversial data. Here we propose to use only one specimen and the shifts of its resonant frequencies to determine those material constants. The mechanical properties of a submicron structure is very sensitive to the defects, which is a main reason for the inconclusive results of the above experiments with several specimens. The presence of the material constants can have significant influence on the micro/nanostructure resonant frequencies. By measuring the shifts of resonant frequencies for one specimen, we determine those material constants by solving an inverse problem. Physically, the inverse problem can be solved because the material constants impact on one resonant frequency differently and the shifts of different resonant frequencies are different to one another. This inverse problem solving method gives not only a new but also a more reliable approach of experimentally determining the material constants.
Liu Y,Zhang Y. Determining the nonlocal parameters of a MI-CRO/nanostructure by the shifts of resonant frequencies[C]ICSV 2016 - 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics,2016.
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