Test procedure for stress damage of ferromagnetic materials based on metal magnetic memory effects

Guoqing Wang; Lijian Yang; Ping Yan; Liwa Wei

doi:10.3139/120.111151

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Test procedure for stress damage of ferromagnetic materials based on metal magnetic memory effects

Guoqing Wang , Lijian Yang , Ping Yan und Liwa Wei

Veröffentlicht/Copyright: 28. Februar 2018

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Abstract

The metal magnetic memory effect is highly sensitive to stress. This experimental investigation of the magnetic memory signal characteristic of a ferromagnetic material at different stress-strain states has been performed using X80 steel specimens. The magnetic signals were measured in accordance with these procedures at twice the elastic deformation and once the elastic deformation to fracture under the tensile load. The results indicate that magnetic memory signals linearly decrease with increasing tensile load in the elastic state and the reverse in the plastic stage. The intensity clearly increases when damage occurs which can be taken as evidence for damage caused by stress. The test was performed on an actual pipeline with a crack created by a special device. The effect of metal magnetic memory for the evaluation of damage caused by stress has thus been verified by this engineering procedure.

Kurzfassung

Der magnetische Memoryeffekt in Metallen ist sehr sensitive gegenüber Spannungen. Für den vorliegenden Beitrag wurde eine experimentelle Untersuchung der magnetischen Memorysignalcharakteristika eines ferromagnetischen Werkstoffes bei verschiedenen Spannungs-Dehnungs-Zuständen durchgeführt, wobei Proben eines Pipelinestahles × 80 verwandt wurden. Die magnetischen Signale wurden unter Anwendung solcher Prozeduren während einer zweifachen elastischen Verformung und einer einfachen Verformung vom elastischen Zustand bis zum Bruch unter Zugbeanspruchung durchgeführt. Die Ergebnisse zeigen, dass die magnetischen Memorysignale linear mit zunehmender Zugbeanspruchung im elastischen Zustand abnehmen und sich im plastischen Zustand umgekehrt zeigen. Die Intensität nimmt evident mit dem Stadium der Schädigung zu, was als Testkriterium für die Schädigung infolge von Spannungen verwandt werden kann. Das Prüfverfahren wurde an einer aktuellen Pipeline mit einem Riss unter Nutzung eines speziellen Aufbaus angewandt. Die Effektivität der Testprozedur basierend auf dem magentischen Memoryeffekt zur Evaluation einer durch Spannungen verursachten Schädigung wurde so mittels einer technischen Anwendung verifiziert.

* Correspondence Address, Associate Prof. Dr. Guoqing Wang, School of Information Science and Engineering, Shenyang University of Technology, Address: No.111, Shenliao west Road, Open Economic District, 110870, Shenyang City, Liaoning Province, P. R. China, E-mail: wangguoqing100110@163.com

Associate Prof. Dr. Guoqing Wang, born 1980, received his PhD degree at the Shenyang University of Technology, Shenyang, China in 2017. He has been working at the School of Information Science and Engineering, Shenyang University of Technology, Shenyang, China. His research interests include materials testing, stress detection technology and related theory, nondestructive testing technology.

Prof. Lijian Yang, born 1957, received his Master degree from the Harbin Institute of Technology, Harbin, China in 1984, and is a professor and doctoral supervisor at the Shenyang University of Technology, Shenyang, China. His research interests include in-detection technology of long distance oil and gas pipeline and related theory, nondestructive testing technology.

Ping Yan, born 1979, received her Bachelor and Master degree from the Liaoning Shihua University, Fushun, China in 2003 and 2007. Her research interests include materials science and nondestructive testing technology.

Assoc. Prof. Liwa Wei, born 1962, is an associate professor at the School of Mechanical Engineering, Liaoning Shihua University, Fushun, China. Her research interests include materials science and nondestructive testing technology.

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Published Online: 2018-02-28

Published in Print: 2018-03-27

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https://doi.org/10.3139/120.111151