A theoretical model of semi-elliptic surface crack growth
| Autor: | Chen Bao, Kaikai Shi, Lixun Cai, Long Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Surface (mathematics)
Materials science business.industry Mechanical Engineering Semi-elliptic surface crack Low cycle fatigue Crack tip opening displacement Aerospace Engineering TL1-4050 Mechanics Radius Structural engineering Linear damage accumulation Curvature Crack growth resistance curve Physics::Geophysics Cracking Crack closure Condensed Matter::Materials Science Newman–Raju formula Elliptic surface Fatigue crack propagation business Motor vehicles. Aeronautics. Astronautics |
| Zdroj: | Chinese Journal of Aeronautics, Vol 27, Iss 3, Pp 730-734 (2014) |
| ISSN: | 1000-9361 |
| Popis: | A theoretical model of semi-elliptic surface crack growth based on the low cycle strain damage accumulation near the crack tip along the cracking direction and the Newman–Raju formula is developed. The crack is regarded as a sharp notch with a small curvature radius and the process zone is assumed to be the size of cyclic plastic zone. The modified Hutchinson, Rice and Rosengren (HRR) formulations are used in the presented study. Assuming that the shape of surface crack front is controlled by two critical points: the deepest point and the surface point. The theoretical model is applied to semi-elliptic surface cracked Al 7075-T6 alloy plate under cyclic loading, and five different initial crack shapes are discussed in present study. Good agreement between experimental and theoretical results is obtained. |
| Databáze: | OpenAIRE |
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