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Fundamentals of Machining Processes, 2nd Edition
book

Fundamentals of Machining Processes, 2nd Edition

by Hassan Abdel-Gawad El-Hofy
August 2013
Beginner to intermediate content levelBeginner to intermediate
562 pages
16h 1m
English
CRC Press
Content preview from Fundamentals of Machining Processes, 2nd Edition
62 Fundamentals of Machining Processes
στ ϕβ γ=+
tan( )
f
ϕ
βγ
=−
+
cot()
1
222
k
f
Merchant called the value of cot
−1
k the machining constant.
3.3.8 Theory of Lee and Shaffer
Lee and Shaffer derived another relationship for φ based on the following
assumptions:
1. The machined material is ideal plastic, which does not strain harden.
2. The shear plane represents a direction of maximum shear stress.
As shown in Figure 3.15, the slip line eld ABC is plastically rigid and
subjected to a uniform state of stress. Accordingly, it is seen that the angle
ABD = η. Therefore,
ηβ45
f
and
=−ηφγ
Therefore,
ϕβγ−+45
f
C
D
45°
45°–β
f
A
γ
t
c
B
β
f
t
FIGURE 3.15
Lee and S ...
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Publisher Resources

ISBN: 9781466577022