Page 304 - Analysis and Design of Machine Elements

Analysis and Design of Machine Elements
282
Steps Computation Results Units
Select the mean stress influence factor as = 0.1 and

= 0.05 by referring to Chapter 2. The detailed calculation

of combined influence factors can refer to Example Problem
2.2 as K = 2.95, K = 2.33. Therefore, the safety factors on

right side of cross section H are:
240
S = −1 = = 14.82

K + 2.95 × 5.48 + 0.1 × 0.26
a
m
−1 140
S = = = 10.70

K + 2.33 × 11 + 0.05 × 11
m
a
2 2
From Eq. (2.50)
S S 14.82 × 10.70

ca
S = √ = √ = 8.68 > 1.5
2
2
S + S 2 14.82 + 10.70 2

So the strength on right side of cross section H is enough.
6. Produce a Specify the final dimensions of the shaft considering design
working details such as tolerances, fillet radii, shoulder heights and
drawing of the keyseat. Produce a working drawing, as shown Figure E10.4.
shaft

Figure E10.2 Initial design for Example Problem 10.1.

Figure E10.3 Force analysis for Example Problem 10.1.