Effect of the geometry of the tip of the preinduced fatigue crack on the level of KIscc
β Scribed by G. N. Nikiforchin; A. T. Tsirul'nik; B. T. Timofeev; R. B. Kvasnitsa; V. A. Fedorova
- Publisher
- Springer
- Year
- 1987
- Tongue
- English
- Weight
- 625 KB
- Volume
- 22
- Category
- Article
- ISSN
- 1573-885X
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Critical values of the crack-tip-opening displacement, COD,, are determined on CIIspecimens having different thicknesses and ligament lengths. COD, is determined using the method of stereophotogrammetry with the scanning-electron microscope. The in&nce of specimen geometry on CODi is studied. Criter
Further resuhs given in the present paper confnm that shallow cracks have larger crack tip opening disp~a~en~ at initiation than deep cracks. This difference in behaviour is shown to be principally caused by the different hydrostatic stresses existing at the tips of shallow and deep cracks. A new me