Secant ModulusEs

The 'secant modulus' is equal to the slope of a line drawn from the origin of the stressstrain graph to a point of interest beyond the elastic limit as shown in Figure 2.4.

Strain (e)

Figure 2.4

The secant modulus is used to describe the material resistance to deformation in the inelastic region of a stress/strain curve and is often expressed as a percentage of Young's Modulus, e.g. 75%-0.75E.

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