An Experimental Study of the Crack Growth Behavior of 16MnR Pressure Vessel Steel
| Autor: | Yanyao Jiang, Zengliang Gao, Xiaogui Wang, Tianwen Zhao |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Materials science
Tension (physics) business.industry Mechanical Engineering Structural engineering Crack growth resistance curve Pressure vessel Crack closure Amplitude Mechanics of Materials mental disorders Ultimate tensile strength Growth rate Composite material Safety Risk Reliability and Quality business Stress intensity factor |
| Zdroj: | Journal of Pressure Vessel Technology. 131 |
| ISSN: | 1528-8978 0094-9930 |
| Popis: | An experimental investigation was conducted on the crack growth behavior of a pressure vessel steel, 16MnR, in ambient air. Standard compact tension specimens were subjected to Mode I loading with several R-ratios and loading amplitudes. Three circular notch sizes ranging from very sharp notch to blunt notch were used. In addition to constant amplitude loading, experiments were conducted to study the influences of overload and loading sequence on crack growth. The results show that the R-ratio has an insignificant influence on the crack growth of the material. The size of the notch together with the R-ratio and loading amplitude has a great influence on the early crack growth from the notch. A single tensile overload during a constant amplitude loading experiment retards the crack growth significantly. Right after the application of an overload, the crack growth rate is higher than that of the stable crack growth observed in the constant amplitude loading. The crack growth rate decreases and reaches a minimum value before it gradually increases and reaches the stable crack growth curve. In high-low sequence loading with the maximum load in the second step lower than that of the first loading step, the preceding higher constant amplitude loading results in a significant crack growth retardation in the second loading step. This phenomenon is similar to the effect of a single tensile overload on the constant amplitude loading. An existing model making use of the stress intensity factor is discussed with respect to its capability to describe the observed crack growth behavior with the influence of overload and sequence loading. |
| Databáze: | OpenAIRE |
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