Numerical Investigation of Strength Mismatch Effect on Ductile Crack Growth Resistance in Welding Pipe
The effect of strength mismatch (ratio between the yield stress of weld metal and base metal, <i>M<sub>y</sub></i>) on the ductile crack growth resistance of welding pipe was numerically analyzed. The ductile fracture behavior of welding pipe was determined while using the si...
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MDPI AG
2020-02-01
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| author | Lin Su Jie Xu Wei Song Lingyu Chu Hanlin Gao Pengpeng Li Filippo Berto |
| author_facet | Lin Su Jie Xu Wei Song Lingyu Chu Hanlin Gao Pengpeng Li Filippo Berto |
| author_sort | Lin Su |
| collection | DOAJ |
| description | The effect of strength mismatch (ratio between the yield stress of weld metal and base metal, <i>M<sub>y</sub></i>) on the ductile crack growth resistance of welding pipe was numerically analyzed. The ductile fracture behavior of welding pipe was determined while using the single edge notched bending (SENB) and single edge notched tension (SENT) specimens, as well as axisymmetric models of circumferentially cracked pipes for comparison. Crack growth resistance curves (as denoted by crack tip opening displacement-resistance (CTOD-R curve) have been computed using the complete Gurson model. A so-called CTOD-<i>Q</i>-<i>M</i> formulation was proposed to calculate the weld mismatch constraint <i>M</i>. It has been shown that the fracture resistance curves significantly increase with the increase of the mismatch ratio. As for SENT and pipe, the larger <i>M<sub>y</sub></i> causes the lower mismatch constraint <i>M</i>, which leads to the higher fracture toughness and crack growth resistance curves. When compared with the standard SENB, the SENT specimen and the cracked pipe have a more similar fracture resistance behavior. The results present grounds for justification of usage of SENT specimens in fracture assessment of welding cracked pipes as an alternative to the traditional conservative SENB specimens. |
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| issn | 2076-3417 |
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| last_indexed | 2024-12-10T21:54:50Z |
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| spelling | doaj.art-8fe1227cc8e74672a8f02bfebf6a743d2022-12-22T01:32:05ZengMDPI AGApplied Sciences2076-34172020-02-01104137410.3390/app10041374app10041374Numerical Investigation of Strength Mismatch Effect on Ductile Crack Growth Resistance in Welding PipeLin Su0Jie Xu1Wei Song2Lingyu Chu3Hanlin Gao4Pengpeng Li5Filippo Berto6SINOPEC Oil & Gas Pipeline Inspection Co., Ltd., Xuzhou 221008, ChinaSchool of Materials Science and Physics, China University of Mining and Technology (CUMT), Xuzhou 221116, ChinaSchool of Mechanical & Electrical Engineering, Xuzhou University of Technology, Xuzhou 221018, ChinaSchool of Materials Science and Physics, China University of Mining and Technology (CUMT), Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology (CUMT), Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology (CUMT), Xuzhou 221116, ChinaDepartment of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, NorwayThe effect of strength mismatch (ratio between the yield stress of weld metal and base metal, <i>M<sub>y</sub></i>) on the ductile crack growth resistance of welding pipe was numerically analyzed. The ductile fracture behavior of welding pipe was determined while using the single edge notched bending (SENB) and single edge notched tension (SENT) specimens, as well as axisymmetric models of circumferentially cracked pipes for comparison. Crack growth resistance curves (as denoted by crack tip opening displacement-resistance (CTOD-R curve) have been computed using the complete Gurson model. A so-called CTOD-<i>Q</i>-<i>M</i> formulation was proposed to calculate the weld mismatch constraint <i>M</i>. It has been shown that the fracture resistance curves significantly increase with the increase of the mismatch ratio. As for SENT and pipe, the larger <i>M<sub>y</sub></i> causes the lower mismatch constraint <i>M</i>, which leads to the higher fracture toughness and crack growth resistance curves. When compared with the standard SENB, the SENT specimen and the cracked pipe have a more similar fracture resistance behavior. The results present grounds for justification of usage of SENT specimens in fracture assessment of welding cracked pipes as an alternative to the traditional conservative SENB specimens.https://www.mdpi.com/2076-3417/10/4/1374weld strength mismatchductile tearingpipelinesmismatch constraint |
| spellingShingle | Lin Su Jie Xu Wei Song Lingyu Chu Hanlin Gao Pengpeng Li Filippo Berto Numerical Investigation of Strength Mismatch Effect on Ductile Crack Growth Resistance in Welding Pipe Applied Sciences weld strength mismatch ductile tearing pipelines mismatch constraint |
| title | Numerical Investigation of Strength Mismatch Effect on Ductile Crack Growth Resistance in Welding Pipe |
| title_full | Numerical Investigation of Strength Mismatch Effect on Ductile Crack Growth Resistance in Welding Pipe |
| title_fullStr | Numerical Investigation of Strength Mismatch Effect on Ductile Crack Growth Resistance in Welding Pipe |
| title_full_unstemmed | Numerical Investigation of Strength Mismatch Effect on Ductile Crack Growth Resistance in Welding Pipe |
| title_short | Numerical Investigation of Strength Mismatch Effect on Ductile Crack Growth Resistance in Welding Pipe |
| title_sort | numerical investigation of strength mismatch effect on ductile crack growth resistance in welding pipe |
| topic | weld strength mismatch ductile tearing pipelines mismatch constraint |
| url | https://www.mdpi.com/2076-3417/10/4/1374 |
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