Let the material properties for the shaft in Problem 4.36 be obtained by using a hollow torsion specimen. The shear yield stress is found to be τY = 200 MPa. Re-solve parts (a) and (b).
Problem 4.36
The shaft in Figure P4.36 has a diameter of 20 mm and is made of a ductile steel (Y = 400 MPa). It is subjected to a combination of static loads as follows: axial load P = 25.0 kN, bending moment Mx = 50.0 N • m, and torque T = 120 N • m.
FIGURE P4.36
a. Determine the factor of safety for a design based on the octahedral shear-stress criterion of failure.
b. Determine the factor of safety for a design based on the maximum shear-stress criterion of failure.
c. Determine the maximum and minimum principal stresses and indicate the directions in which they act at point B shown.
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