Evolution of fracture mechanics parameters relevant to narrow notch increment as a measure of fatigue damage accumulation
| Autor: | Yury Matvienko, Svyatoslav Eleonsky, Vladimir Pisarev |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Deformation (mechanics) Mechanical Engineering Fracture mechanics 02 engineering and technology Mechanics Edge (geometry) 021001 nanoscience & nanotechnology Accumulation function Industrial and Manufacturing Engineering 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Modeling and Simulation Electronic speckle pattern interferometry General Materials Science 0210 nano-technology Displacement (fluid) Stress intensity factor Stress concentration |
| Zdroj: | International Journal of Fatigue. 149:106310 |
| ISSN: | 0142-1123 |
| DOI: | 10.1016/j.ijfatigue.2021.106310 |
| Popis: | An unconventional destructive method for quantitative assessment of fatigue damage accumulation in the stress concentration zone is proposed and verified. Damage accumulation in strain gradient area is reached by preliminary push–pull loading of plane specimens with open holes. Narrow notches, emanating from the hole edge at different stages of low-cycle fatigue, serve to manifest a damage degree. These notches are inserted under constant external load. Deformation response to local material removing is measured by electronic speckle pattern interferometry (ESPI) in terms of in-plane displacement components. It is shown that normalized values of the notch mouth open displacement (NMOD), the stress intensity factor (SIF) and the T-stress can reliably be used as current damage parameter. Numerical integration of curves, describing an evolution of fracture mechanics parameters, produces the damage accumulation function in an explicit form. It is established that all three fracture mechanics parameters give close results. |
| Databáze: | OpenAIRE |
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