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 KIC.[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:
with the unit .
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 Archived 2016-01-27 at the Wayback Machine., Digital compendium - Sandvik, (in Swedish), Retrieved 22 January 2016
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