Open AccessInvestigation of the properties correlation of physical and mechanical characteristics of ferromagnets based on magnetoelastic sensors of mechanical stresses
Author(s) -
V. V. Tsyhanchuk,
Л. С. Шлапак
Publication year - 2018
Publication title -
naftogazova energetika
Language(s) - English
Resource type - Journals
eISSN - 2415-3109
pISSN - 1993-9868
DOI - 10.31471/1993-9868-2018-2(30)-32-39
Subject(s) - transducer , stress (linguistics) , hysteresis , strain gauge , acoustics , materials science , ferromagnetism , actuator , position (finance) , perpendicular , signal (programming language) , ultrasonic sensor , mechanical engineering , computer science , structural engineering , electrical engineering , engineering , physics , composite material , mathematics , condensed matter physics , philosophy , linguistics , geometry , finance , economics , programming language
The determination of the stress condition is a topical issue. At present, various non-destructive examination methods, such as strain gauge, magnetic, ultrasonic methods, and others are used to analyze pipelines stress condition. Each of them has its advantages and disadvantages. There is often the need to use several experimental non-destructive methods simultaneously. In this regard, the magnetic inspection holds a unique position. In this case a significant role is played by primary transducers, which directly perceive the effect of mechanical stresses and turn it into the electrical signal for further processing of the input information. The change of magnetic characteristics is closely connected with the physical effect on the monitored object. The advantages include the high mobility of equipment, the ability to perform control without the direct contact of transducer with the object under study. At the same time, there are several disadvantages inherent particularly in the magnetic methods – magnetoelastic hysteresis, in which there is the divergence of induction values during loading and unloading. The greatest divergence occurs in the lead-off cycle and decreases during repeated cycles. The best way is to embrace the complete information available in the hysteresis loop. Another method is not only to take measurements at one point (even if this measurement is carried out in two mutually perpendicular directions), but to perform surface sounding of the object in a certain plane. Therefore, the most efficient method is to compare the magnetic relief of loaded (in the structure) and unloaded (in reserve) pipes of one manufacturer and from one lot. Thus, using the examination method of pipelines stress condition, based on the evaluation of metal magnetic properties of pipes, creates the complex solution to the problems of reliability improvement of pipeline systems.