PROBLEM 3.113 Three points on the nonlinear stress-strain diagram used in Prob. 3.112 are (0, 0), (0.0015, 55 MPa), and (0.003, 80 MPa). By fitting the polynomial through these points, the following approximate relation has been obtained. Solve Prob. 3.113 using this relation, Eq. (3.2), and Eq. (3.26). PROBLEM 3.112 A 50-mm diameter cylinder is made of a brass for which the stress-strain diagram is as shown. Knowing that the angle of twist is 5? in a 725-mm length, determine by approximate means the magnitude T of torque applied to the shaft.
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