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Development of the crack detection system of the steel structures by using magnetic properties

利用磁特性的钢结构裂纹检测系统的研制

基本信息

批准号：
16206084
负责人：
OSAWA Naoki
金额：
$ 27.04万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16206084/
关键词：
magnetic property crack damage NDT weld joint numerical simulation き裂検出隅肉溶接継手

项目摘要

For safe use of a steel structure thing, soundness inspection is required. It inquired for the purpose of development of the "crack detection system" by the non-destructive test using magnetic property which can be used for soundness inspection, and the following results were obtained.1) In order to consider component degradation, the magnetic property calculation program based on a Landau-Lifshiz-Gilbert equation was developed.2) While proposing the fatigue damage appraisal method by the non-destructive test which used magnetic property based on the consideration using the developed program, the magnetic property measuring device was developed.3) Using the developed magnetic property measuring device, static tensile load and the measurement examination of the degree of component damage according to load repeatedly were done, it checked that detection of component damage was possible, and the magnetic property parameter which can be used for damage evaluation was found out.4) While developing the small sensor for magnetic property measurement for the "crack detection system", for signal processing, the program was newly developed and it built as a "crack detection system".5) Using the developed "crack detection system", for the plain, butt welded joint and fillet welding joint specimens, the crack detection examination was carried out and the effective magnetic property parameter was found out. With this parameter, it was not concerned with the existence of paint, and the back and front of the plate, but checked that detection of a crack was possible.6) The check of the usefulness of the measuring device analyzed and developed about crack damage using the commercial magnetic field analysis program and the method of building a database required for crack form evaluation were clarified.The existence of the crack which exists in the weld joints of the steel structure is detectable by the "crack detection system" developed by this research.

为了保证钢结构物的安全使用，需要进行坚固性检查。为了开发利用磁性的无损检测的“裂纹检测系统”（可用于完好性检查），进行了调查，得到了以下结果。1）为了考虑部件劣化，开发了基于Landau-Lifshiz-吉尔伯特方程的磁性能计算程序; 2）在提出非线性疲劳损伤评估方法的同时，3）利用所开发的磁性能测量装置，反复进行静拉伸载荷和根据载荷对构件损伤程度的测量检查，验证了构件损伤检测的可能性，4）在研制“裂纹检测系统”的小型磁性能测量传感器的同时，对信号处理程序进行了新的开发，建成了“裂纹检测系统”。5）利用研制的“裂纹检测系统”，对平焊、对接焊和角焊接头试件，进行了探伤检验，找出了有效的磁性能参数。有了这个参数，它不关心油漆的存在，和背面和正面的板，但检查是否可能检测到裂缝。6）阐明了使用商用磁场分析程序分析和开发的关于裂纹损伤的测量装置的有用性的检查和建立裂纹形式评估所需的数据库的方法。本研究所开发的“裂缝检测系统”可对钢结构的焊接接头进行检测。