BRINELL HARDNESS GAUGE
Hardness gauge can be measured by suppressing the material know amount of load is applied with a load of another material. Materials cope plastic deformation resistance is associated with yield strength, such as the relative hardness can be determined by applying a force. The use of hard materials such as diamond indenter as the deformation force is applied only on the material (test specimen) are limited.
Brinell and Vickers in the methods is measuring hardness, the trail is measured by the size of the penetration depth is measured by the Rockwell method.
Measured values, but the square of the diameter of the examination burden and spheres are comparable with if a fixed rate. This ratio "load rating" is called.
- Minimum material (sample) thickness of Sm = 17xbily should be up to the penetration depth.
- Sample’s surface must be clean and bright.
- Permanent mark diameter should be about 0,2D<0,7D.
- The edge part of the sample remaining on the center of the track center of the track and its distance from another trace should be twice the diameter (2d).
- Track diameter (d) shall be measured with a precision of 0.01 mm. The trail is not fully circular diameters measured in the direction perpendicular to each other, to be averaged.
- For hardness up to 400 HB usually are using steel balls. Carbide balls are preferred for hard made materials.