基于磁记忆方法的抽油杆裂纹扩展监测

doi:10.11896/j.issn.1005-023X.2017.024.037

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Abstract The whole crack propagation process of sucker rod specimen was monitored by magnetic memory testing instrument on the basis of tension-tension fatigue experiments, and the synthetic gradient limit coefficients of magnetic signal characterizing stress concentration degree were extracted simultaneously. The fracture mechanics parameters of crack tip were computed by finite element method, and the stress intensity factors corresponding to different crack lengths were obtained. The results showed that the characteristic parameters of magnetic memory signal based on experimental data are in accordance with the stress intensity factors calculated by finite element simulation, which can reflect the fatigue crack propagation process and cumulative damage effectively, providing theoretical reference for blank selection before remanufacturing.

Key words： magnetic memory technique crack propagation fracture mechanics finite element method sucker rod

Published: 08 May 2018

CLC number:

TG115.28

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	Articles by authors
	LENG Jiancheng
	TIAN Hongxu
	ZHOU Guoqiang
	WU Zemin

Cite this article:

LENG Jiancheng,TIAN Hongxu,ZHOU Guoqiang, et al. Crack Propagation Monitoring of Sucker Rod Based on Magnetic Memory Method[J]. Materials Reports, 2017, 31(24): 178-190.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.024.037 OR http://www.mater-rep.com/EN/Y2017/V31/I24/178

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