I know that the Esec modulus is a percentage of the Youngs modulus (0.7E or 0.85E).
Please explain in detail?
Thank you
Please read book
Annual Report of the National Advisory Committee for Aeronautics
https://books.google.co.in › books
TABLE 1 LOCAL - INSTABILITY TEST RESULTS FOR EXTRUDED 75S - T6 ALUMINUM - ALLOY H ... the variation of the secant modulus Esec and tangent modulus Etan with ..United States. National Advisory Committee for Aeronautics · 1949 · Aeronautics
The secant modulus is one of the methods for evaluating the modulus of elasticity of a material by finding the slope of a line drawn from the origin of the stress-strain diagram and intersecting the curve at a "point of interest". It is basically a stress over strain ratio, Esec = σ /ε. Therefore, the secant modulus will equal the Young's modulus of elasticity of a material in the elastic region (at the yield point and below). However, in the plastic region the description of material properties requires more complex considerations, such as the changes in the poisson's ratio; therefore, the secant modulus is used to simplify the stress-strain relationship of a material in the plastic region.
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