Page 108 - Analysis and Design of Machine Elements

Analysis and Design of Machine Elements
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(a) must be a shear load
(b) must be a tensile load
(c) couldbeeitherashearloadoratensileload
(d) both a shear load and a tensile load

Calculation Questions

1 A preloaded bolt carries a fluctuating axial load varying from 0 to F.Assumingthe
criterial area of the bolt is A , the stiffness of the bolt and the connected member are
c
k and k , respectively. Decide on the stress amplitude.
b m
2 A flange is attached to a pressurized cylinder by 16 identical bolts. The fluid
pressure is cycled from 0 to 1.2 MPa. Let D = 500 mm, the resultant load on the
′
clamped members must be kept as Q = 1.5F. The allowable stress of bolt material
p
is [ ] = 160 MPa. Determine the size of the bolts.

Figure P3.3 Illustration for Calculation Question 2.

p
D

3 A flange and pressure vessel is connected by 12 M16 (d = 13.6 mm) bolts. The inner
1
diameter of the pressure vessel is D = 250 mm. The allowable stress of the bolt is
−2
[ ] = 120 N mm . The resultant load on the connected member is Q’ = 1.5F (F is
p
the operating load). Decide on the maximum pressure the bolted joint can carry.

Figure P3.4 Illustration for Calculation Question 3.

D