ADR-Auto Range
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9901X0215 Issue 5
Appendix 3 – Stress Calculations
The ADR-Auto calculates stress as follows –
Cube, Cylinder/Core, Cylinder/Tensile, Brick, Block – Peak Load/Sample Area.
Beam – The stress for all sample types except the 40 x 40.1 x 160 beam is calculated using
the following formula –
Stress = (Peak Load x Roller Separation)/ (Width x Depth x Depth)
The calculation for the 40 x 40.1 x 160 beam is
Stress = (1.5 x Peak Load x Roller Separation)/(Depth x Depth x Depth)
Stress is not calculated for Flags, Kerbs and Channels.
Type R and S Blocks – Stress is calculated as peak load/plan area multiplied by a correction
factor which depends on the sample thickness and shape as follows –
Thickness and Shape
Correction Factor
60 mm Thick Plain
1.00
60 mm Thick Chamfered
1.06
65 mm Thick Plain
1.0
65 mm Thick Chamfered
1.06
80 mm Thick Plain
1.12
80 mm Thick Chamfered
1.18
100 mm Thick Plain
1.18
100 mm Thick Chamfered
1.24
