Figure 6.23 shows the tensile engineering stress–strain curve in the elastic region for a...

Figure 6.23 shows the tensile engineering stress–strain curve in the elastic region for a gray cast iron. Determine (a) the tangent modulus at 25 MPa (3625 psi) and (b) the secant modulus taken to 35 MPa (5000 psi).

Figure 6.23 Tensile stress–strain behavior for a gray cast iron.