5(a). The wide-flange beam shown below is made of a high-strength, low-alloy steel for which

Oy = 50 ksi and ou=70 ksi ksi. Using a factor of safety of 3.0, determine the largest

couple that can be applied to the beam when it is bent about the x-axis. Neglect the

effect of fillets.

2aQasin.

3--5 ft-k

+

C

12.in.

-1.0-in.

10 in 210 in.

Figure 5

5(b). A cast-iron part is acted upon by the 5 ft-k couple shown below. Knowing that

E = 10.6x 10³ ksi and neglecting the effect of fillets, determine (a) the maximum tensile

Compressive stresses in the casting, (b) the radius of curvature p of the casting.

Note: The cress-section for cast-iron part is as shown in Figure 6.

1 in

8 in.

4 in.

1 in.

6 in.

1 in.