Fracture toughness measurement with fatigue-precracked single edge-notched beam specimens of WC-Co hard metal |
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Authors: | H Iizuka M Tanaka |
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Affiliation: | (1) Mining College, Akita University, Tegatagakuen-cho 1-1, 010 Akita, Japan |
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Abstract: | The plain-strain fracture toughness of WC-8%Co hard metal, K
IC, was measured using single edge-notched beam (SENB) specimens with fatigue precrack. The fatigue precrack was introduced with compressive fatigue cycling in four-point bending at room temperature. Since stable fatigue-crack propagation was obtained from the notch tip, it was easy to control the fatigue-precrack length. A reasonable K
IC value of 13.3 MPa m1/2 was obtained with the fatigue-precracked SENB specimens in four-point bending. The compressive fatigue-precracking technique in four-point bending was simple and convenient, and is therefore applicable to precracking in a variety of brittle materials prior to fracture-toughness measurements. |
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