Year developed 1962 | ||
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Practical use Determination of the fracture toughness for cemented carbides. | ||
The Palmqvist method, or the Palmqvist toughness test, (after Sven Robert Palmqvist) is a common method to determine the fracture toughness for cemented carbides. In this case, the materials fracture toughness is represented by the critical stress intensity factor KIC.
Approach
The Palmqvist-method uses the lengths of the cracks from a number of Vickers indentions to determine the fracture toughness. The critical stress intensity factor is then given by: