[1]苏三庆,孙灏江,王威,等.弯曲荷载作用下焊接钢板件金属磁记忆效应试验研究[J].西安建筑科技大学学报(自然科学版),2017,49(06):771-776.[doi:10.15986/j.1006-7930.2017.06.001]
　SU Sanqing,SUN Haojiang,WANG Wei,et al.Experimental research on metal magnetic memory effect of butt welded steel plate under bending load[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2017,49(06):771-776.[doi:10.15986/j.1006-7930.2017.06.001]
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弯曲荷载作用下焊接钢板件金属磁记忆效应试验研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
49
期数:
2017年06期
页码:
771-776
栏目:
出版日期:
2017-12-31

文章信息/Info

Title:
Experimental research on metal magnetic memory effect of butt welded steel plate under bending load
文章编号:
1006-7930(2017)06-0771-06
作者:
苏三庆; 孙灏江; 王威;  易术春
（西安建筑科技大学 土木工程学院，陕西 西安 710055）
Author(s):
SU Sanqing;  SUN Haojiang;  WANG Wei;  YI Shuchun
( School of Civil Engineering, Xi′an Univ. of Arch. & Tech., Xi′an 710055, China)
关键词:
磁记忆检测 ; 对接焊缝 ; 三点受弯 ; 波峰-波谷; 反转
Keywords:
metal magnetic memory;  Butt-welded;  three-point bending;  peak-valley; reverse
分类号:
TU391
DOI:
10.15986/j.1006-7930.2017.06.001
文献标志码:
A
摘要:
为将金属磁记忆无损检测技术用于弯曲荷载下焊接试件的检测，分别对Q345b钢有缺陷焊接试件及无缺陷焊接试件进行了三点受弯试验. 通过对比两组试件在初始阶段、弹性阶段以及塑性阶段下磁记忆法向分量曲线及磁场梯度曲线，得到焊接缺陷位置在不同阶段的特异性信号.试验结果表明：初始阶段，磁记忆法向分量曲线无明显特征信号，在判断焊接初始缺陷时缺乏准确性，而磁场梯度曲线中出现具有最大幅值的异变位置，可以定性判断试件焊接初始缺陷位置；弹性阶段，有缺陷焊接试件磁记忆曲线在缺陷处产生明显异变磁记忆信号即波峰-波谷，无缺陷焊接试件则未形成明显异变磁记忆信号.随着荷载增加，两组试件磁场强度法向分量均呈现逐渐减小的趋势；塑性阶段，有缺陷焊接试件缺陷部位异变磁记忆信号发生反转，表征了试件在该位置进入塑性阶段.无缺陷焊接试件在试件接近破坏时曲线才出现反转现象.
Abstract:
In order to evaluate the damage degree of butt welded steel plate under bending load through metal magnetic memory (MMM), the three-point flexural test of Q345b specimen with defect and without defect were conducted respectively. Characteristic signals were received by comparing the normal signal and gradient curve of two group specimens in its initial stage, elastic stage and plastic stage. Experimental result reveal that in initial stage, abnormal position with peak amplitude of gradient curve can qualitatively determine initial defect position. But there are no significant signal of normal component curve, which can′t help judge the initial defect position accurately. In the elastic stage, the magnetic curve of defective specimen generate mutation, that is peak-valley phenomenon. As to specimen without defect, there are no significant mutation of the magnetic curve. The magnetic normal component decreased with the increase of loading. In the plastic stage, the peak-valley phenomenon is reversed with respect to elastic stage, which can help predict the whether the speciment enter the plastic stage. As to the specimen without defect, the reversal of peak-valley phenomenon occurred when the specimen is close to failure.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2016-08-04 修改稿日期:2017-08-23 基金项目:国家自然科学基金项目（51478383、51578449）；陕西省自然科学基金项目（2015JM5192） 第一作者:苏三庆（1961-），男，教授，博导，主要从事结构健康监测及混凝土结构等方面的研究. E-mail：sussq@xauat.edu.cn
更新日期/Last Update: 2018-02-10