A steel post /t if with a hollow circular cross section is fixed at the base and free at the top (see figure). The in net and outer diameters arc d 1 = 96 mm and d 2 = 110 mm, respectively, and the length is L = 4.0 m. A cable CED passes through a fitting that is welded to the side of the post. The distance between the plane of the cable (plane CBD) and the axis of the post is e = 100 mm, and the angles between the cable and the ground arc a = 53.13º. The cable is preten-sioned by tightening the turn buck les. If the deflection at the top of the post is limited to δ = 20 mm, what is the maximum allowable tensile force Tin the cable? (Assume E = 205 GPa.)
A steel post /t if with a hollow circular cross section is fixed at the base and free at the top (see figure). The in net and outer diameters arc d 1 = 96 mm and d 2 = 110 mm, respectively, and the length is L = 4.0 m. A cable CED passes through a fitting that is welded to the side of the post. The distance between the plane of the cable (plane CBD) and the axis of the post is e = 100 mm, and the angles between the cable and the ground arc a = 53.13º. The cable is preten-sioned by tightening the turn buck les. If the deflection at the top of the post is limited to δ = 20 mm, what is the maximum allowable tensile force Tin the cable? (Assume E = 205 GPa.)
Solution Summary: The author explains the maximum allowable tensile force T in the cable is 8.289 kN.
A steel post /t if with a hollow circular cross section is fixed at the base and free at the top (see figure). The in net and outer diameters arc d1= 96 mm and d2= 110 mm, respectively, and the length is L = 4.0 m.
A cable CED passes through a fitting that is welded to the side of the post. The distance between the plane of the cable (plane CBD) and the axis of the post is e = 100 mm, and the angles between the cable and the ground arc a = 53.13º. The cable is preten-sioned by tightening the turn buck les.
If the deflection at the top of the post is limited to
δ
= 20 mm, what is the maximum allowable tensile force Tin the cable? (Assume E = 205 GPa.)
2 A metal block of mass m = 10 kg is sliding along a frictionless surface with an initial speed
Vo, as indicated below. The block then slides above an electromagnetic brake that applies a
force FEB to the block, opposing its motion. The magnitude of the electromagnetic force
varies quadratically with the distance moved along the brake (x):
10
FEB = kx²,
with k
= 5
N
m²
V₁ = 8 m/s
m = 10 kg
FEB
Frictionless surface
Electromagnetic brake
⇒x
Determine how far the block slides along the electromagnetic brake before stopping, in m.
Q1: Determine the length, angle of contact, and width of a 9.75 mm thick
leather belt required to transmit 15 kW from a motor running at 900 r.p.m. The
diameter of the driving pulley of the motor is 300 mm. The driven pulley runs at
300 r.p.m. and the distance between the centers of two pulleys is 3 meters. The
density of the leather is 1000 kg/m³. The maximum allowable stress in the
leather is 2.5 MPa. The coefficient of friction between the leather and pulley is
0.3. Assume open belt drive.
5. A 15 kW and 1200 r.p.m. motor drives a compressor at 300 r.p.m. through a pair of spur gears having
20° stub teeth. The centre to centre distance between the shafts is 400 mm. The motor pinion is made
of forged steel having an allowable static stress as 210 MPa, while the gear is made of cast steel
having allowable static stress as 140 MPa. Assuming that the drive operates 8 to 10 hours per day
under light shock conditions, find from the standpoint of strength,
1. Module; 2. Face width and 3. Number of teeth and pitch circle diameter of each gear.
Check the gears thus designed from the consideration of wear. The surface endurance limit may be
taken as 700 MPa. [Ans. m = 6 mm; b= 60 mm; Tp=24; T=96; Dp = 144mm; DG = 576 mm]
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