Detection method based on magnetic anisotropy for stress concentration area of pipe wall
In view of the problem that the stress concentration leads to the yield failure of the pipe wall,a magnetic anisotropy method was proposed to detect the stress concentration area of pipe wall.From the point of energy,the mechanism of magnetic anisotropy caused by stress on the pipe wall was studied.The mathematical model of equivalent stress on the pipe wall and the output voltage signal of magnetic anisotropy probe was established.By calculating the equivalent stress on the pipe wall,the yield failure was judged,and an experimental platform for stress detection was built.The experimental results show that the stress can lead to the magnetic anisotropy of the pipe wall.The magnetic anisotropy detection method can detect the change trend of the equivalent stress of the pipe wall and the angle of extension line in the direction of principal stress,and judge whether the stress concentration area is generated on the pipe wall.
magnetic anisotropypipe wallyield failurethird strength theoryminimum energy principleenergy conservation lawmagnetic susceptibilitystress concentration area
万方数据
维普
