为实现铁磁材料内部应力分布的无损评估,在地磁场激励条件下,将ASTM1020钢Y型坡口焊缝试样水平放置,通过测量试样表面上方10mm处磁感应强度垂直分量的分布,得到了试样热影响区的应力分布。试样应力分布磁测量结果同盲孔法应力分布测量结果具有较好的一致性,说明在不用人工磁化场磁化材料的情况下,仅依靠地磁场激励就可以通过磁检测方法获得材料内部应力的分布情况。 In order to realize the nondestructive evaluation of the internal stress distribution of the ferromagnetic material, the sample of the Y-groove weld of ASTM1020 steel was placed horizontally under the condition of geomagnetic field excitation. By measuring the distribution of the vertical component of the magnetic induction intensity at 10mm above the surface of the specimen, Stress distribution in heat affected zone of sample. The stress distribution measurement results of the sample stress distribution are in good agreement with those of the blind hole method. It shows that the internal stress Distribution.