Local surface elastic constants by resonant-ultrasound microscopy
Local surface elastic constants by resonant-ultrasound microscopy
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DOI：
10.1063/1.1755432
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发表时间：
2004-06
影响因子：
3.2
通讯作者：
Jiayong Tian;H. Ogi;T. Tada;M. Hirao;H. Ledbetter
中科院分区：
文献类型：
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作者：
Jiayong Tian;H. Ogi;T. Tada;M. Hirao;H. Ledbetter
我们报告了一种测量固体表面弹性常数分布的方法——共振超声显微镜。通过周围的螺线管线圈将振荡电场施加到硅酸镁石（La3Ga5SiO14）晶体的长方体振荡器上，我们在没有电极和电线的情况下产生并检测了晶体的振动。样品与振荡器的声耦合仅在晶体底面上的波腹振动点处进行。晶体的共振频率偏移反映了接触区域中样本的弹性常数。点接触测量可以对材料的局部弹性常数进行灵敏的定量评估。作为说明性示例，我们测量了 Nb-Ti/Cu 树脂超导丝的弹性刚度分布。我们将我们的测量结果与静态接触和动态接触模型进行了比较。
We report a method—resonant-ultrasound microscopy—for measuring elastic-constant distribution over a solid’s surface. Applying an oscillating electric field to a rectangular-parallelepiped oscillator of langasite (La3Ga5SiO14) crystal by a surrounding solenoid coil, we generated and detected vibrations of the crystal without electrodes and without wires. Acoustic coupling of the specimen to the oscillator is only made at an antinodal vibration point on the crystal’s bottom surface. The crystal’s resonance-frequency shift reflects elastic constants of the specimen in the contacting area. Point-contact measurement permits sensitive, quantitative evaluation of a material’s local elastic constants. As an illustrating example, we measured the elastic-stiffness distribution of a Nb–Ti/Cu resin superconductive wire. We compared our measurements with both static-contact and dynamic-contact models.