An LCF lifetime model for PM superalloy considering equivalent ellipsoidal inclusion
The non-metallic inclusions are one of the main defects in powder metallurgy (PM) superalloy, which may promote crack initiation under the cyclic loading and seriously affect the safety of aero engines. To quantify the effects of inclusions to the low cycle fatigue (LCF) lifetime, the LCF tests on P...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422015617 |
| _version_ | 1798006086711640064 |
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| author | Dianyin Hu Miaodong Zhao Jinchao Pan Xi Liu Haihe Sun Rongqiao Wang |
| author_facet | Dianyin Hu Miaodong Zhao Jinchao Pan Xi Liu Haihe Sun Rongqiao Wang |
| author_sort | Dianyin Hu |
| collection | DOAJ |
| description | The non-metallic inclusions are one of the main defects in powder metallurgy (PM) superalloy, which may promote crack initiation under the cyclic loading and seriously affect the safety of aero engines. To quantify the effects of inclusions to the low cycle fatigue (LCF) lifetime, the LCF tests on PM FGH96 superalloy are firstly carried out to observe the inclusions on fracture. By equating the inclusion to an ellipsoid, the relationship between the inclusion's feature and the stress field is established based on Eshelby's theory and finite element method (FEM). Then, the ellipse-equated fracture is determined according to the maximum shear stress's location. Subsequently, key inclusion-related parameters influencing the LCF lifetime are introduced to construct a modified SWT model. Finally, the model's accuracy is validated by comparing with the LCF experimental data. It is demonstrated that the modified SWT model has a good accuracy, with an improvement of scattering band from ±15 to ±4 compared with the original SWT model. |
| first_indexed | 2024-04-11T12:50:29Z |
| format | Article |
| id | doaj.art-27cfed5639fb47778fd64ea54ceca368 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-11T12:50:29Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-27cfed5639fb47778fd64ea54ceca3682022-12-22T04:23:14ZengElsevierJournal of Materials Research and Technology2238-78542022-11-012117051713An LCF lifetime model for PM superalloy considering equivalent ellipsoidal inclusionDianyin Hu0Miaodong Zhao1Jinchao Pan2Xi Liu3Haihe Sun4Rongqiao Wang5Research Institute of Aero-Engine, Beihang University, Beijing, 100191, China; Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing, 100191, China; United Research Center of Mid-Small Aero-Engine, Beijing, 100191, ChinaSchool of Energy and Power Engineering, Beihang University, Beijing, 100191, ChinaSchool of Energy and Power Engineering, Beihang University, Beijing, 100191, ChinaBeijing Key Laboratory of Aero-Engine Structure and Strength, Beijing, 100191, China; United Research Center of Mid-Small Aero-Engine, Beijing, 100191, China; School of Energy and Power Engineering, Beihang University, Beijing, 100191, China; Corresponding author.Research Institute of Aero-Engine, Beihang University, Beijing, 100191, China; Sichuan Gas Turbine Establishment, Aero Engine Corporation of China, Chengdu, 610500, ChinaResearch Institute of Aero-Engine, Beihang University, Beijing, 100191, China; United Research Center of Mid-Small Aero-Engine, Beijing, 100191, China; School of Energy and Power Engineering, Beihang University, Beijing, 100191, ChinaThe non-metallic inclusions are one of the main defects in powder metallurgy (PM) superalloy, which may promote crack initiation under the cyclic loading and seriously affect the safety of aero engines. To quantify the effects of inclusions to the low cycle fatigue (LCF) lifetime, the LCF tests on PM FGH96 superalloy are firstly carried out to observe the inclusions on fracture. By equating the inclusion to an ellipsoid, the relationship between the inclusion's feature and the stress field is established based on Eshelby's theory and finite element method (FEM). Then, the ellipse-equated fracture is determined according to the maximum shear stress's location. Subsequently, key inclusion-related parameters influencing the LCF lifetime are introduced to construct a modified SWT model. Finally, the model's accuracy is validated by comparing with the LCF experimental data. It is demonstrated that the modified SWT model has a good accuracy, with an improvement of scattering band from ±15 to ±4 compared with the original SWT model.http://www.sciencedirect.com/science/article/pii/S2238785422015617PM FGH96 superalloyInclusionLow cycle fatigueEshelby's theoryLifetime prediction |
| spellingShingle | Dianyin Hu Miaodong Zhao Jinchao Pan Xi Liu Haihe Sun Rongqiao Wang An LCF lifetime model for PM superalloy considering equivalent ellipsoidal inclusion Journal of Materials Research and Technology PM FGH96 superalloy Inclusion Low cycle fatigue Eshelby's theory Lifetime prediction |
| title | An LCF lifetime model for PM superalloy considering equivalent ellipsoidal inclusion |
| title_full | An LCF lifetime model for PM superalloy considering equivalent ellipsoidal inclusion |
| title_fullStr | An LCF lifetime model for PM superalloy considering equivalent ellipsoidal inclusion |
| title_full_unstemmed | An LCF lifetime model for PM superalloy considering equivalent ellipsoidal inclusion |
| title_short | An LCF lifetime model for PM superalloy considering equivalent ellipsoidal inclusion |
| title_sort | lcf lifetime model for pm superalloy considering equivalent ellipsoidal inclusion |
| topic | PM FGH96 superalloy Inclusion Low cycle fatigue Eshelby's theory Lifetime prediction |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422015617 |
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