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Development of Nondestructive Evaluation System of Damage Process inside Materials by Ultrasonics-Wavelet Method

超声-小波法材料内部损伤过程无损评价系统的研制

基本信息

批准号：
07555617
负责人：
KISHIMOTO Kikuo
金额：
$ 0.45万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555617/
关键词：
Ultrasonics Wavelet Transform Material Damage Nondestructive Evaluation

项目摘要

For new materials such as fiber reinforced materials, polymer alloys, or functionally graded materials, macroscopic mechanical properties are often controlled by microscopic structures. In order to develop new materials having high stregth or high functions and to utilize such materials effectively, it is important to accurately understand the change in microscopic structures and associated damages inside materials under various loading conditions. Ultrasonic evaluation of materials seems an appropriate technique for such purposes. However, it has been difficult to effectively extract meaningful information from ultrasonic waveform.The final object of this study is to develop a system for nondestructive evaluation of the change in microscopic structures and damage inside materials by applying the wavelet transform to the time-frequency analysis of ultrasonic waveform. The results obtained during the project are as follows :(1) Some basic investigations were conducted about the time-frequency analysis of elastic waves by means of wavelet transform.(2) According to the results of (1), a new software was developed for extracting parameters related to microscopic structures of damage of materials by the time-frequency analysis of ultrasonic waveform.(3) Experimental equipment was developed for ultrasonic testing of materials.(4) Ultrasonic testing was performed for specimen partially damaged.(5) Data obtained in (4) were analyzed by the software developed in (3) to extract parameters related to microscopic structures or damage of materials.(6) Some papers were published in journals.

对于纤维增强材料、聚合物合金或功能梯度材料等新材料，其宏观力学性能往往由微观结构控制。为了开发具有高强度或高功能的新材料并有效地利用这些材料，准确地了解材料内部微观结构的变化及其在各种加载条件下的损伤是非常重要的。超声评价材料似乎是一种适合于这种目的的技术。然而，从超声波形中有效提取有意义的信息一直是一个难题。本研究的最终目的是将小波变换应用于超声波形的时频分析，建立一套材料微观结构变化和内部损伤的无损评价系统。研究结果表明：(1)利用小波变换对弹性波的时频分析进行了一些基础研究。(2)根据(1)的结果，开发了一种基于超声波形时频分析提取材料损伤细观结构相关参数的软件。(3)研制了材料超声检测实验设备。(4)对部分损伤试样进行超声检测。(5)利用(3)开发的软件对(4)中得到的数据进行分析，提取与材料微观结构或损伤相关的参数。(6)部分论文在期刊上发表。