Effect of Prestrain on Fatigue Crack Growth in Low-carbon Steel
The current procedures of fatigue design of marine pipeline components allow for extending service life by considering a certain portion of the crack growth well before it turns into the instable phase. In structural components of transport systems material may undergo plastic pre-strain during the...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Peter the Great St. Petersburg Polytechnic University
2011-05-01
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| Series: | Инженерно-строительный журнал |
| Subjects: | |
| Online Access: | http://www.engstroy.spb.ru/index_2011_03/petinov_cracks.pdf |
| Summary: | The current procedures of fatigue design of marine pipeline components allow for extending service life by considering a certain portion of the crack growth well before it turns into the instable phase. In structural components of transport systems material may undergo plastic pre-strain during the construction. The effect of pre-strain on the crack growth may be different depending on the material properties. Fatigue crack propagation was examined in testing symmetrically notched specimens machined from pre-strained steel plate coupons. Non-simultaneous crack initiation and propagation at the notches was reduced to symmetrical scheme by a simple coordinate transformation procedure. It was found that tensile pre-strain up to 0.01 did not substantially change the crack growth rate related to the stress intensity factor scale. Further increase of plastic pre-strain of material up to 0.15 caused almost two-times slowing down the crack growth rate compared to that of virgin material. |
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| ISSN: | 2071-4726 2071-0305 |