A grade 30 gray cast iron is subjected to a load F applied to a 1 by -in cross-section link with a --in-diameter hole drilled in the center as depicted in Fig. 6–31a. The sur- faces are machined. In the neighborhood of the hole, what is the factor of safety guard- ing against failure under the following conditions: (a) The load F = 1000 lbf tensile, steady. (b) The load is 1000 lbf repeatedly applied. (c) The load fluctuates between – 1000 lbf and 300 lbf without column action. %3D - Use the Smith-Dolan fatigue locus.

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Chapter1: Tension, Compression, And Shear
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MECH.ENG. DESIGN 1 PART 2

A grade 30 gray cast iron is subjected to a load F applied to a 1 by -in cross-section
link with a -in-diameter hole drilled in the center as depicted in Fig. 6–31a. The sur-
faces are machined. In the neighborhood of the hole, what is the factor of safety guard-
ing against failure under the following conditions:
(a) The load F = 1000 lbf tensile, steady.
(b) The load is 1000 lbf repeatedly applied.
(c) The load fluctuates between – 1000 lbf and 300 lbf without column action.
Use the Smith-Dolan fatigue locus.
%3D
-
F
Sut = 31 ksi, Se= 109 ksi
ka k, S̟'= 14 ksi
q = 0.2
||
-1 in–
in D. drill
in
Fig. 6–31a
F
Shigley's Mechanical Engineering Design
Transcribed Image Text:A grade 30 gray cast iron is subjected to a load F applied to a 1 by -in cross-section link with a -in-diameter hole drilled in the center as depicted in Fig. 6–31a. The sur- faces are machined. In the neighborhood of the hole, what is the factor of safety guard- ing against failure under the following conditions: (a) The load F = 1000 lbf tensile, steady. (b) The load is 1000 lbf repeatedly applied. (c) The load fluctuates between – 1000 lbf and 300 lbf without column action. Use the Smith-Dolan fatigue locus. %3D - F Sut = 31 ksi, Se= 109 ksi ka k, S̟'= 14 ksi q = 0.2 || -1 in– in D. drill in Fig. 6–31a F Shigley's Mechanical Engineering Design
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