EVALUATION OF SURFACE DAMAGE,DEGRADATION AND STRESS WITH BROADBAND SURFACE ELASTIC WAVES

利用宽带表面弹性波评估表面损伤、退化和应力

基本信息

批准号：
08455056
负责人：
KAWASHIMA Koichiro
金额：
$ 1.09万
依托单位：
NAGOYA INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455056/
关键词：
SURFACE WAVE ULTRASONIC LEAKY RAYLEIGH WAVE WAVE PROPAGATION FEM SURFACE DAMAGE ACOUSTELASTICITY STRESS MEASUREMENT 音弾性応力測定

项目摘要

(1) A digital ultrasonic measurement system of the surface waves has been established to measure their velocities of the leaky Rayleigh, creeping and surface SV waves as well as attenuation of the leaky Rayleigh wave with line-focused broadband PVDF ultrasonic transducers of 10-50MHz. The relative precision of their velocities measured on fused quartz and 2017 aluminum alloy with a 10MHz transducer are 0.015,0.03 and 0.018%, respectively.(2) The densities of the surface layr of fused quartz and 2017 aluminum alloy were measure nondestructively by using the velocities of those surface waves and attenuation of the leaky Rayleigh wave. The measured values are agreed with those measured by Archimedes'method within 10%.(3) The acoustoelastic coefficients of Rayleigh wave on 2017 aluminum alloy are found to be-2.3 and 0.9x10^<-5>/MP_a for the loading and transverse direction.(4) Young's modulus of TiN coating of 4mum thickness on WC-Co substrate is estimated to be 400GP_a by using the dispersion of the leaky Rayleigh wave and a wave equations of layred structures. The value is consistent with the reported so far.Wave propagation excited by a line-focused transducer has been analyzed by FEM for an aluminum plate which is immersed in water. The calculated and measured velocities of the leaky Rayleigh and creeping waves agree within 2%. The attenuation of the leaky Rayleigh wave due to energy leak into water also agree well with the measured.The minute cracks generated in fatigue tests on stainless steel have been detected as a drop of amplitude spectra of the leaky Rayleigh wave in high frequency range.

（1）已经建立了表面波的数字超声测量系统，以测量其泄漏的雷利，爬行和表面SV波的速度，以及衰减带有线路的宽带PVDF超声传感器的泄漏的雷利波。其在熔融石英和2017年铝合金中测得的速度的相对精度分别为0.015,0.03和0.018％。（2）通过使用非层状铝铝的表面密度来测量融合量的石英表面密度。这些表面波的速度和漏水雷利波的衰减。测量值与Archimedes'Method在10％以内测量的值一致。（3）发现2017年雷利波的声音弹性系数为2.3和0.9x10^<-5>/mp_a，用于负载和横向和横向和横向（4）通过使用泄漏的雷利波和铺设结构的波动方程，估计WC-CO底物上4MUM厚度的Young tin涂层模量为400GP_A。该值与迄今为止报道的。通过FEM对以线条换能器进行分析的铝板，该铝板已被浸入水中。计算出的和测量的渗漏雷利和爬行波的速度在2％以内一致。由于能量泄漏到水中而导致的漏水雷利波的衰减也与测量的衰减也很吻合。在不锈钢上疲劳测试中产生的微小裂缝已被检测到高频范围内泄漏的雷利波的振幅光谱。