Prob. 2.9-5. A bar with rectangular cross section is subjected

to an axial tensile load P, as shown in Fig. P2.9-5. (a) Determine

the angle, call it enas of the plane NN' on which Tnt = 2σn, that

is, the plane on which the magnitude of the shear stress is

twice the magnitude of the normal stress. (b) Determine the

angle, call it Onb, of the plane on which on = 27nt (Hint: You

can get approximate answers from Fig. 2.34.)

P

N

N'

P2.9-5

(5000)