A bar with cross-sectional area A is subjected to equal and opposite tensile forces F at its ends. Consider a plane through the bar making an angle 6 with a plane at right angles to the bar (Fig. 11.64).
(a) What is the tensile (normal) stress at this plane in terms of F, A, and 6?
(b) What is the shear (tangential) stress at the plane in terms of F, A, and 6?
(c) For what value of 6 is the tensile stress a maximum?
(d) For what value of 6 is the shear stress a maximum?