Influence of notch radius and R-curve behaviour on the fracture toughness evaluation of WC-Co cemented carbides |
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Authors: | Y Torres L Llanes M Anglada |
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Affiliation: | Departamento de Ciencia del los Materiales e Ingeniería Metalúrgica, Universidad Politécnica de Cataluña, Avda. Diagonal, 647, 08028 Barcelona, Spain |
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Abstract: | In this work the apparent fracture toughness of different grades of WC-Co cemented carbides has been evaluated by means of the single edge V-notched beam (SEVNB) method. The results are analysed, as a function of both the binder mean free path and the maximum steady-state crack shielding value, following a theoretical approach which assumes the existence of a small crack at the notch tip. The experimental findings indicate that larger defects at the notch tip and/or existence of R-curve behaviour imply higher (i.e. less restricted) values of the minimum notch radius required in SEVNB specimens for a reliable assessment of the fracture toughness of cemented carbides. |
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Keywords: | Cemented carbides Fracture mechanics Stress intensity factor Single edge V-notched beam R-curve |
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