Fatigue test of welds with defects based on magnetic memory technology

REN Shangkun; ZU Ruili

doi:10.7527/S1000-6893.2018.22454

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2019 , Vol. 40 >Issue 3: 422454 - 422454

DOI: https://doi.org/10.7527/S1000-6893.2018.22454

Material Engineering and Mechanical Manufacturing

Fatigue test of welds with defects based on magnetic memory technology

REN Shangkun ,
ZU Ruili

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Key Laboratory of Nondestructive Testing of Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China

Received date: 2018-06-14

Revised date: 2018-07-03

Online published: 2018-09-05

Supported by

National Natural Science Foundation of China (51865039)

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Abstract

The ray detection, fatigue test and orthogonal magnetic memory signal measurement are performed on 40Cr welding plates containing different invisible damages, exploring the characteristics of magnetic memory signals under the fatigue stress. The experimental results are accidental because the magnetic characteristics under the single measurement method cannot characterize the variations of the weld plate under fatigue cyclic loading. The study found that the integral gradient feature of the magnetic field vector and the combined gradient feature of the magnetic field vector can be used to evaluate the fatigue damage process of the weld plate. The study also establishes a fatigue damage model with the gradient feature of magnetic vector as the damage parameter, so that the fatigue life of the welded component with invisible damage can be quantitatively evaluated. The study also provides reference for further research on metal magnetic memory technology in quantitative evaluation of welding defects.

Key words： nondestructive testing; metal magnetic memory testing; integral gradient feature of magnetic field vector; synthesized gradient feature of magnetic field vector; fatigue life

Cite this article

REN Shangkun , ZU Ruili . Fatigue test of welds with defects based on magnetic memory technology[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019 , 40(3) : 422454 -422454 . DOI: 10.7527/S1000-6893.2018.22454

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