November 2013
Intermediate to advanced
538 pages
18h 12m
English
Content preview from Materials and Process Selection for Engineering Design, 3rd Edition
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176 Materials and Process Selection for Engineering Design
y
Ll
EI
=
3
3
where
l is the length of the cantilever
E is the elastic modulus of the cantilever material = 210 GPa
I is the second moment of area of the cross section
From Table 4.4,
I
bb Ll
yE
===
×
×× ×
() ()2
12 3
1000 1000
350 210 10
33 3
3
The preceding equation gives the width of the beam, b = 14.77 mm.
Taking a factor of safety n = 1.5 and using Equation 6.3,
Z
nM L
=
×
×
===
××
14 77 21477
12 14 77
2148
15 1000
1420
3
.( .)
.
.
mm
YS
3
The safe value of L = 2033 N.
6.3 DESIGNING FOR STIFFNESS
In addition to being strong enough to resist the expected service loads without yield-
ing, there may also be the added requi
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