Bildanalyse PicEd Cora
Hardness measurement methods of Vickers, Brinell and Knoop
Methods:
The hardness of materials is determined by measuring the image which is generated when a very hard material (e.g. diamond) is pressed onto the material with a certain force.
The shape of the impression is a rhomb according to Vickers and Knoop and a circle according to Brinell. The area of rhomb or circle determines the hardness.
To evaluate hardness in our image analysis system a
microscopic image of the impression has to be made.
After a calibration, which has to be made only when the system is installed, the
adjustment of pixels to physical units (mm, µm) is settled.
How it is realized:
The shape is measured in the digital image.
According to the three methods, there are three fields offering the appropriate
tools for measurements.
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Measurement of Vickers hardness |
In case of Vickers methods only a rhomb has to be fitted to the impression. The software is realized so that in every day work the fit can be done with a minimum amount of actions and mouseclicks. Documentation of the result can be done with opulent features. |
Result processing:
The simplest form of documentation is the image itself as above. The PicEd Software has the possibility of a standard printout. E.g. a length of 500µm in the microscopic image, when measured on the printout yields 50mm.
The database options of the PicEd system offer the possibility to write the results of hardness measurement directly to an appropriate field of the database. Thus errors in writing results on paper and typing it later in the database are avoided.
