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The influence of crack length on fatigue crack growth in deep sharp notches |
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| Authors: | R. Pippan M. Berger H. P. Stüwe |
| Affiliation: | 1. Erich-Schmid-Institut für Festk?rperphysik der ?sterreichischen Akademie der Wissenschaften, Leoben, Austria 2. Balzers Company, FL-Liechtenstein, Austria 3. Institut für Metallphysik der Montanuniversit?t Leoben, Austria 4. Erich-Schmid-Institut für Festk?rperphysik der ?sterreichischen Akademie der Wissenschafen, Leoben, Austria |
| Abstract: | The fatigue crack growth rateda/dN of short cracks and the transition to long crack behavior were investigated for ARMCO-iron. Deep notched specimens with very small notch radius (between 1.5 and 4 μm) were used. The experiments were performed with constant stress intensity ranges for various stress ratios; the fatigue crack growth rate was measured as a function of the crack length. The results permit a discussion of the mechanisms responsible for the different behavior of “short” and “long” cracks. |
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