= Secant Modulus in the Mississippi State University Virtual Laboratory for Solid Mechanics
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https://www.ae.msstate.edu/vlsm/materials/strength_chars/secant.htm
Institutional teaching source, Strength and Stiffness Characteristics, Secant Modulus definition and pointA diagram. Defines the origin-to-point slope, dependence on the selected point, and notation Es. No individual author or publication date is inferred. The article's polynomial, integral identity and tensile numbers are original derivations.
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