Problem 115
What force is required to punch a 20-mm-diameter hole in a plate that is 25 mm thick? The
shear strength is 350 MN/m2.
Answer: P = 549.8 kN
Problem 116
As in Fig. 1-11c, a hole is to be punched out of a plate having a shearing strength of 40 ksi. The
compressive stress in the punch is limited to 50 ksi.
(a) Compute the maximum thickness of plate in which a hole 2.5 inches in diameter can be
punched.
Answer: t= 0.781 inch
(b) If the plate is 0.25 inch thick, determine the diameter of the smallest hole that can be
punched.
Answer: d = 0.8 in
Problem 117
Find the smallest diameter bolt that can be used in the clevis shown in Fig. 1-11b if P = 400 kN.
The shearing strength of the bolt is 300 MPa.
3Answer: 29.13 mm
Problem 118
A 200-mm-diameter pulley is prevented from rotating relative to 60-mm-diameter shaft by a
70-mm-long key, as shown in Fig. P-118. If a torque T = 2.2 kN·m is applied to the shaft,
determine the width b if the allowable shearing stress in the key is 60 MPa.
3
3Answer: b = 17.46 mm
Problem 119
Compute the shearing stress in the pin at B for the member supported as shown in Fig. P-119.
The pin diameter is 20 mm.
