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The following calculations are used in this test:
Load
P = (R - Corr) * C
where,
P = Load
R = Dial reading
Corr = Proving ring correction
C = Proving ring constant
Stress
σ = P / A
where,
σ = Stress
A = Piston area
California Bearing Ratio
CBR = 100 * σc / σs
where,
σc = Corrected stress
σs = Standard stress