Page 138 - Analysis and Design of Machine Elements

Analysis and Design of Machine Elements
116
2 In Figure P5.2, a butt weld carries a moment M and tension F, while the other loads
z
are negligible. If [ ] is the allowable stress of the weld, which of the following can be
used to calculate the strength of weld seam? ______
Figure P5.2 Illustration for Objective Question 2.

2 ≤ [ ]
(a) = 6M z
lt
(b) = 6M z F ≤ [ ]
2 +
lt lt
(c) = 6M z ≤ [ ]
l 2 t
F
6M z
(d) = + ≤ [ ]
l 2 t lt
Calculation Questions
1 Two plates are joined by rivets. The dimensions shown in Figure P5.3 are t = 10 mm,
d = 10 mm, w = 70 mm, l = 100 mm, e = 15 mm and c = 35 mm. The allowable
tensile stress of the plates is [ ] = 200 MPa. The allowable bearing stress between
the rivet and plate is [ ] = 400 MPa and the allowable shear stress of the rivet is
p
[ ] = 180 MPa. Calculate the maximum load that can be carried by the rivet joint.

ϕd Figure P5.3 Illustration for Calculation
Question 1.
t
t
F
F
c c

e

F w l F

e