Short fatigue crack initiation at inclusions

Date

1997-04-23

Author

Kaynak, Cevdet

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In this study, the initiation and early growth behaviour of short fatigue cracks in En7A steel with a high content of elongated MnS inclusions was investigated, by generating and evaluating data on the growth of short fatigue cracks under various stress levels and stress ratios for the six principal specimen orientations. Short cracks usually initiated at the debonded interfaces between the matrix and the inclusions. If there was no debonding, cracking sometimes occurred in the inclusions. In the early stages, short cracks propagated by a mechanism of inclusion influenced growth. Under low stress levels, usually one short crack was initiated which dominated most of the fatigue life, while under high stress levels there was multicrack interaction.

URI

https://hdl.handle.net/11511/55272

Conference Name

5th European Conference on Advanced Materials and Processes and Applications (EUROMAT 97)

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Department of Metallurgical and Materials Engineering, Conference / Seminar

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Initiation and early growth of short fatigue cracks at inclusions Kaynak, Cevdet; Baker, TJ (Informa UK Limited, 1996-05-01) In this study, the initiation and early growth behaviour of short fatigue cracks in En7A steel with a high content of elongated MnS inclusions was investigated by generating and evaluating data on the growth of short fatigue cracks under various stress levels and stress ratios for the six principal specimen orientations. Short cracks usually initiated at the debonded interfaces between the matrix and the inclusions. If there was no debonding, cracking sometimes occurred in the inclusions. In the early stage...
Inclusion induced anisotropy of short fatigue crack growth in steel Kaynak, Cevdet; Baker, TJ (Informa UK Limited, 1996-07-01) In this study, the growth behaviour of short fatigue cracks in En7A steel with a high content of elongated MnS inclusions was investigated by generating and evaluating the short crack data under different loading conditions for the six principal specimen orientations. Short cracks showed a strong anisotropic behaviour in which they grew much faster in the transverse and short transverse orientations than in the longitudinal orientations in all fatigue processes. This was due to the relatively high content o...
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Short fatigue crack growth in AL 2024-T3 and AL 7075-T6 Kaynak, Cevdet (Elsevier BV, 1992-01-01) Short fatigue crack growth behavior was investigated. The crack growth was monitored using a replica technique for cracks propagating on the specimen notch from an initial length of 40-50 mum to the specimen thickness of 2.3 mm. As part of the AGARD round robin test program Al 2024-T3 and Al 7075-T6 specimens with semi-circular notches on one edge were tested under R-ratios of 0.5, 0, -1 and -2. For each R -ratio several stress levels were used. In order to compare the behavior of short and long cracks, the...
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Citation Formats

C. Kaynak, “Short fatigue crack initiation at inclusions,” presented at the 5th European Conference on Advanced Materials and Processes and Applications (EUROMAT 97), MAASTRICHT, NETHERLANDS, 1997, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/55272.