Interface® strain gages are specially made of fatigue resistant nickel-chromium alloy. Strain gage fatigue characteristics are most conveniently viewed in terms of strain rather than stress. Figure 3 shows a Strain-N curve for Interface® strain gage material. Strain is a dimensionless quantity of normally very small magnitude. The micro strain unit is simply 1,000,000 strain units and is used for convenience. Stress and strain for any particular material are related by a constant which is the modulus of elasticity (30 x 1,000,000 for steel and 10 x 1,000,000 for aluminum), allowing convenient comparison of S-N curves and Strain-N curves.
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