TITLE:
The Study of Electromagnetic Stress Testing Method on Oil-Gas Pipelines Based on WT
AUTHORS:
Bin Liu, Wanru Sun, Yiren Lin
KEYWORDS:
Oil-Gas Pipeline, Electromagnetic Induction, Magnetic Conductance, Stress Concentration, Nondestructive Testing
JOURNAL NAME:
Geomaterials,
Vol.4 No.2,
April
10,
2014
ABSTRACT: This paper
proposes an effective method for early diagnosis (stress concentrating) of the
oil-gas pipeline. Based on the principle of electromagnetic induction Faraday, we
have designed and realized the nondestructive testing system for stress concentration
area of ferromagnetic materials by means of the research of metal materials
inverse magnetostrictive effect mechanism. The system changes the influence
degree of the stress in ferromagnetic materials’ magnetic conductance to the
corresponding voltage array by using discrete wavelet analysis method to
process the data, in which not only the measuring accuracy is improved, but
also the stress concentration is more directly reflected. The experiments confirm
that the electromagnetic stress testing method is feasible and valid.