Problem 2

Rigid bar ABC is supported by a pin at bracket A and by tie rod (1).

Tie rod (1) has a diameter of 5 mm, and it is supported by double-

shear pin connections at B and D. The pin at bracket A is a single-

shear connection. All pins are 7 mm in diameter. Assume a = 600

mm, b = 300 mm, h = 450 mm, P = 900 N, and 0 = 55°. Determine

the following:

D

(1)

a) The normal stress in rod (1)

b) The average shear stress in pin B

c) The average shear stress in pin A

d) Conceptual question: If pins A and B are made of the same material, and load P is

gradually increased, then which pin do you expect to fail first? Briefly (1-2 sentences max)

explain your response.

b

C