Effects of tensile/compressive overloads on fatigue crack growth behavior of an extra-low-interstitial titanium alloy
| Autor: | Chuanyong Chen, Jianzhong Liu, Duyi Ye, Lina Zhang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mechanical Engineering Alloy Titanium alloy 02 engineering and technology engineering.material Paris' law 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Crack growth resistance curve Crack closure 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Deflection (engineering) Ultimate tensile strength engineering General Materials Science Composite material 0210 nano-technology Civil and Structural Engineering |
| Zdroj: | International Journal of Mechanical Sciences. 118:55-66 |
| ISSN: | 0020-7403 |
| DOI: | 10.1016/j.ijmecsci.2016.09.014 |
| Popis: | In this paper, fatigue crack propagation tests of an extra-low-interstitial titanium alloy (Ti-6Al-4V ELI) were performed under various tensile/compressive overloads in an otherwise constant amplitude loading sequence. The effects of the tensile/compressive overloads on the crack growth rate, crack growth path and crack growth profile of the Ti-alloy were investigated. The results showed that the tensile overload resulted in an overload-ratio-dependent crack growth retardation, while almost no effect of the compressive overload on the crack growth rate was found. With the increasing tensile overload ratio, the crack closure effect exhibited increase. Tensile overloads also enlarge the crack deflection and produced more secondary cracks in the overload-affected zone of the crack-tip. The possible reasons for the overload-dependent crack growth behavior of Ti-6Al-4V ELI alloy were further analyzed in terms of microstructure, crack closure and crack-tip plastic zone. |
| Databáze: | OpenAIRE |
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