Plane‐strain fracture toughness is a critical property of metal matrix composites, especially for cemented carbides, ceramics, and tool materials. In this study, we have investigated, numerically and experimentally, the method involving three‐point bend test of a chevron‐notched specimen to evaluate fracture toughness of cemented carbides. A comprehensive formula is presented for a wide range of test dimensions and chevron notch angles. Cemented carbides with different toughness levels were tested. The proposed formula provides a more accurate and valid expression compared with existing methods. It offers an accurate, convenient, and practical method for toughness testing of cemented carbide, ceramics, tool materials, and other metal matrix composites.

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