Abstract
Recent observations on copper polycrystals fatigued in the high-cycle range have shown that crack initiation occurs not only in emerging persistent slip bands (PSBs) but also at grain boundaries (GBs) at sites where PSBs impinge. A dislocation model of the latter type of PSB-GB crack initiation is formulated. The model is based on a recent description of the growth of extrusions at emerging PSBs in single crystals. It is assumed that PSB-GB crack initiation results from the fact that PSBs in constrained grains exert a stress on the GBs because the latter impede the growth of extrusions. From a comparison with experimental data it is concluded that the proposed model provides a satisfactory semi-quantitative description of PSB-GB fatigue crack initiation.
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© 1983 Martinus Nijhoff Publishers, The Hague
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Mughrabi, H. (1983). A Model of High-Cycle Fatigue-Crack Initiation at Grain Boundaries by Persistent Slip Bands. In: Sih, G.C., Provan, J.W. (eds) Defects, Fracture and Fatigue. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6821-9_11
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DOI: https://doi.org/10.1007/978-94-009-6821-9_11
Publisher Name: Springer, Dordrecht
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