13. A steel cantilever beam, as shown in Fig. 6.21, is subjected to a transverse load at its end th from 45 N up to 135 N down as the axial load varies from 110 N (compression) to 450 N Determine the required diameter at the change of section for infinite life using a factor of sa The strength properties are as follows: = 550 MPa = 470 MPa = 275 MPa Ultimate strength Yield strength Endurance limit 45 N 125 mm 110 N 450 N 2d 0.2d 180 mm 135 N

13. A steel cantilever beam, as shown in Fig. 6.21, is subjected to a transverse load at its end th from 45 N up to 135 N down as the axial load varies from 110 N (compression) to 450 N Determine the required diameter at the change of section for infinite life using a factor of sa The strength properties are as follows: = 550 MPa = 470 MPa = 275 MPa Ultimate strength Yield strength Endurance limit 45 N 125 mm 110 N 450 N 2d 0.2d 180 mm 135 N

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Question

13. A steel cantilever beam, as shown in Fig. 6.21, is subjected to a transverse load at its end that varies
from 45 N up to 135 N down as the axial load varies from 110 N (compression) to 450 N (tension).
Detemine the required diameter at the change of section for infinite life using a factor of safety of 2.
The strength properties are as follows:
= 550 MPa
= 470 MPa
= 275 MPa
Ultimate strength
Yield strength
Endurance limit
45 N
125 mm
110 N 450 N
2d
0.2d
180 mm
135 N
Fig. 6.21
The stress concentration factors for bending and axial loads are 1.44 and 1.63 respectively, at the
change of cross-section. Take size factor= 0.85 and suface finish factor = 0.9.
[Ans. 12.5 mm]

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