Stress ratio, A or R

The algebraic ratio of two specified stress values in a stress cycle. Two commonly used stress ratios are (1) the ratio of the alternating stress amplitude to the mean stress, A = Sa/Sm, and (2) the ratio of the minimum stress to the maximum stress, R = Smin/Smaxs 
Accreditations Aster Accredia Accredia Accredia Tuv Nord Nadcap Crit
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