Figure shows, for a gray cast iron, the tensile engineering

Figure shows, for a gray cast iron, the tensile engineering

Figure shows, for a gray cast iron, the tensile engineering stress–strain curve in the elastic region. Determine
(a) The tangent modulus at 10.3MPa (1500psi), and
(b) The secant modulus taken to 6.9MPa(1000psi).

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