Palmqvist method

Materials testing
Palmqvist method
Determined crack lengths from a Vickers indention.
Technical information

Searched property	Fracture toughness
Year developed	1962^[1]
Practical use	Determination of the fracture toughness for cemented carbides.
Website ISO-standard	ISO 28079:2009, Palmqvist toughness test

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 K_IC.^[2]

Approach

The Palmqvist-method uses the lengths of the cracks from a number of Vickers indentions to determine the fracture toughness.^[2] The critical stress intensity factor is then given by:

$K_{Ic}=6.2*{\sqrt {\frac {HV50}{\sum _{Cracklengths}\,}}}$ with the unit $Pa{\sqrt {m}}$ .

Notes

↑ S. Palmqvist, Occurrence of crack formation during Vickers indentation as a measure of the toughness of hard materials, Arch Eisenhuettenwes, 33 (1962) 629-333.
1 2 Detta är hårdmetall, Digital compendium - Sandvik, (in Swedish), Retrieved 22 January 2016

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