Experimental Research on Predicting Fatigue Life of Remanufacturing Sucker Rod by Magnetic Memory Testing
Fatigue life evaluation of retired parts is always one of the most difficult problems in remanufacturing engineering. Tension-tension fatigue experiments of precut groove sucker rod specimens were conducted, and on-line magnetic memory signals on the surfaces of specimens under different cyclic numb...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2016-09-01
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| Series: | Journal of Materials Engineering |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.09.016 |
| Summary: | Fatigue life evaluation of retired parts is always one of the most difficult problems in remanufacturing engineering. Tension-tension fatigue experiments of precut groove sucker rod specimens were conducted, and on-line magnetic memory signals on the surfaces of specimens under different cyclic numbers were measured by magnetic memory testing instrument, and the variation regularities of the tangential amplitude and normal peak-peak value with different fatigue damage were exploited simultaneously. The Lissajous figure introduced shows that the surrounded area becomes larger, the largest and smaller finally, whilst the maximum closure area corresponds to the critical state of macroscopic crack about to unstable propagation. Furthermore, the maximum value of synthetic magnetic field gradient is proposed as an index to predict fatigue life. The results demonstrate that the characteristic parameter can reflect different development stages of fatigue cycles, and the quantitative relationship between the characteristic parameter and the normalized life is established by virtue of Gauss function, which can be used to predict the fatigue life of sucker rods. |
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| ISSN: | 1001-4381 1001-4381 |