Graphite is a brittle, polygranular material, which brings difficulties to the research of its fracture toughness. In the present paper, an experimental work on measuring the fracture toughness of graphite IG-11 is described. Three-point bending tests were employed. The effects of graphite specimen size, thickness, and the relative crack length a/W are studied in the tests. The deformation and strain near the crack tips are measured by both the strain gauge method and the digital speckle correlation method (DSCM). The results indicate that the fracture toughness of graphite IG-11 is in a range of 0.82∼1.27 MPa.m1/2, with an averaged value of 1.038 MPa.m1/2.

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