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A STUDY ON UTILITY FOR NONDESTRUCTIVE EVALUATION OF DEFECT USING VIBLATION IN THIN PLATE

薄板振动无损检测缺陷实用性研究

基本信息

批准号：
16560421
负责人：
KAWAKAMI Tetsutaro
金额：
$ 1.92万
依托单位：
TOKAI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560421/
关键词：
NONDESTRUCTIVE EVALUATION THIN PLATE WAVE PROPAGATION DEFECT LOW FREQUENCY VIBRATION DYNAMIC RESPONSE INSPECTION OF DEFECT BOUNDARY ELEMENT METHOD 非破壊評価振動法数値シミュレーション動的応答問題

项目摘要

It is important to extend the life of structure by repairing for structure. Therefore, the importance of nondestructive evaluation that detect the defect in structure increases. Furthermore, the improvement and economization of nondestructive evaluation method are necessary.The purpose of this investigation is the development of the easy and economical nondestructive evaluation method for thin plate. The proposed nondestructive evaluation methods in this investigation were applied the characteristic of dynamic response for the thin plate. Specifically, the visualization of the scattering waves that are occurred by the defect in the thin plate during the wave propagation carried out.Firstly, the dynamic properties of composite plate that was assume to be thin plate with defect were analyzed by the boundary element method. The composite plate is define in this analysis by combining an infinite thin plate and a finite thin plate, that is casted into the infinite plate, and whose material properties are different from the infinite plate. To investigate the dynamic response of the composite thin plate, numerical analyses for some models are carried out. The results show the dynamic response of the composite plates well, and also confirm the usefulness of the proposed method for the composite plate problems. Furthermore, the proposed nondestructive evaluation methods were applied to numerical and practical experiments of evaluation for a defect in thin plate. Results of numerical and practical experiments on the these models show that this nondestructive evaruation method has high apprppriateness and usefulness to inspect defect in thin plate.

对结构进行维修是延长结构寿命的重要手段。因此，对结构中的缺陷进行无损检测的重要性日益增加。此外，无损检测方法的改进和经济化也是必要的，本研究的目的是发展一种简便、经济的薄板无损检测方法。本文提出的无损检测方法是针对薄板的动态响应特性而提出的。具体而言，对薄板中缺陷产生的散射波在波传播过程中的可视化进行了研究。首先，假设复合材料薄板为含缺陷薄板，采用边界元法分析了其动力特性。在分析中，复合板是由一个无限大的薄板和一个有限大的薄板组合而成的，该薄板被铸造成无限大的薄板，其材料特性与无限大的薄板不同。为了研究复合材料薄板的动力响应，对一些模型进行了数值分析。计算结果较好地反映了复合材料板的动力响应，也验证了本文方法对复合材料板问题的有效性。将所提出的无损检测方法应用于薄板缺陷检测的数值实验和实际实验。对这些模型的数值计算和实际检测结果表明，这种无损检测方法对薄板缺陷的检测具有较高的适用性和实用性。