Stress force
ENGLISH
Instruction Manual
6
Biegehebel
Bruchwinkelmesser
MEASURING OF THE COMPRESSION STRENGTH
FIBRE DIRECTION
The core sample is loaded parallel with stress until the first failure.
After the first failure occurs the maximal fracture force or the axial fracture
strength can be determined.
Stress applied in the direction of the fibres
Stress force
Note:
When assessing fracture strength, it is important that the red tow
indicator of the Fractometer II is positioned counter clockwise to the zero
mark.
Make sure that the fiber direction of the core sample is positioned
parallel to the applied force that presses onto the core sample.
IMPORTANT NOTICE:
The 5 mm diameter core sample should not overhang, because this may
influence the overall measurement.
Stability value
(yellow scale)
Strength in units of
Newton
(blue scale)
Zero- Mark
Core sample
COMPRESSION STRENGTHS
During the bending, tension fracture is transferred on the core sample
in radial direction. The axial fracture strength is the resistance, which
the trunk opposes to a failure by applying axial stress.
Axial Compression Strength
