焊管
銲管
한관
Welded Pipe and Tube
2015年
11期
52-55
,共4页
检测%拉伸试验%磁记忆%磁性指数%应力集中
檢測%拉伸試驗%磁記憶%磁性指數%應力集中
검측%랍신시험%자기억%자성지수%응력집중
testing%tensile test%magnetic memory%magnetic index%stress concentration
分别研究了Q345钢板标准拉伸试样、开横向V形槽试样、开深度方向“”形槽试样在拉伸试验不同阶段的磁记忆检测信号表征。依据ISO 24497《无损检测－金属磁记忆检测》对信号特征进行了分析，结果表明，应力集中部位的磁性指数m随着应力集中程度的增加而增大。应力集中程度越高，磁场法向分量过零点，磁场切向分量和磁场梯度具有最大值的对应性越好。不同材料的磁性指数极限值对于现场检测时应力集中程度的判定具有指导意义。
分彆研究瞭Q345鋼闆標準拉伸試樣、開橫嚮V形槽試樣、開深度方嚮“”形槽試樣在拉伸試驗不同階段的磁記憶檢測信號錶徵。依據ISO 24497《無損檢測－金屬磁記憶檢測》對信號特徵進行瞭分析，結果錶明，應力集中部位的磁性指數m隨著應力集中程度的增加而增大。應力集中程度越高，磁場法嚮分量過零點，磁場切嚮分量和磁場梯度具有最大值的對應性越好。不同材料的磁性指數極限值對于現場檢測時應力集中程度的判定具有指導意義。
분별연구료Q345강판표준랍신시양、개횡향V형조시양、개심도방향“”형조시양재랍신시험불동계단적자기억검측신호표정。의거ISO 24497《무손검측－금속자기억검측》대신호특정진행료분석，결과표명，응력집중부위적자성지수m수착응력집중정도적증가이증대。응력집중정도월고，자장법향분량과영점，자장절향분량화자장제도구유최대치적대응성월호。불동재료적자성지수겁한치대우현장검측시응력집중정도적판정구유지도의의。
The magnetic memory testing signal characteristics of Q345 steel plate several specimens in tensile test different stages were respectively studied, including tensile sample, transverse V-type tensile sample and depth direction -groove. The test signal was analyzed based on the ISO 24497 “Non-destructive testing-Metal magnetic memory”. The results showed that the magnetic index (m) increases with the increase of stress concentration degree, and the higher correspondence among tangential component of magnetic field has maximum value and the normal component of magnetic field acquires zero value and maximum magnetic field gradient with higher stress concentration degree. The limiting value of the magnetic index(mlimn) for different materials has important significance on the judgement of stress concentration degree for magnetic memory testing on site.
