Page 495 - Shigley's Mechanical Engineering Design

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470 Mechanical Engineering Design

20
M20 × 2.5
40

Problem 8–68 70
Dimensions in millimeters.

40
20
80

8–69 The bolted connection shown in the figure is subjected to a tensile shear load of 90 kN. The
bolts are ISO class 5.8 and the material is cold-drawn AISI 1015 steel. Find the factor of safety
of the connection for all possible modes of failure.

35 60 60 35
15
M20 × 2.5
Problem 8–69 35
Dimensions in millimeters.
35
20
8–70 The figure shows a connection that employs three SAE grade 4 bolts. The tensile shear load
on the joint is 5000 lbf. The members are cold-drawn bars of AISI 1020 steel. Find the factor
of safety for each possible mode of failure.

5 in 1 1 in
8 8 5 in
16
1 in-20 UNC
5 in 4
8
Problem 8–70 1 in

5 in 3
8 1 in
16
3 5
2 in in
8 16
8–71 A beam is made up by bolting together two cold-drawn bars of AISI 1018 steel as a lap joint,
as shown in the figure. The bolts used are ISO 5.8. Ignoring any twisting, determine the fac-
tor of safety of the connection.

y
A
3.2 kN
200 50 100 350
Problem 8–71 10
Dimensions in millimeters. x 50
10
A M12 1.75
Section A–A