Hard metals – Determination of bending strength

Sample form A: Height 5 (+/- 0,25) mm | Width 5 (+/- 0,25) mm | Length 35 (+/- 1) mm
To avoid premature fracture, the samples must be ground to a surface roughness of 0,63 µm Ra

Bending bearing distance: 30 mm

Bending support and pressure fin Ø: 3,2 to 6,0 mm

Test speed: force increase 600 N / second 

Special features

• Depending on the sample geometry (samples with or without chamfer), a correction factor must be taken into account in the result
• An average value must be calculated from at least 5 tests. The results must be rounded to 10 N/mm²
• The support rollers and the bending fin must be made of hard metal
• Result Rbm Bending Stress

Note:
Photo taken with standard test tool – larger roller diameter than standard specification