Fatigue and Variable Loading Example 4 In the figure below the shaft is simply supported in ball bearings at A and D. The shaft rotates and the stationary load F is 6.8 kN. All fillets have a 3-mm radius. The shaft is machined from AISI 1050 cold- drawn steel. Estimate the life of the part. Repeat with: working temp T=330 °C, reliability R=90% 30 A ◄ R₁ 10 250 32 B 75 (a) 6.8 kN 38 C 100-125 10->> -35 D R₂ 30

Fatigue and Variable Loading Example 4 In the figure below the shaft is simply supported in ball bearings at A and D. The shaft rotates and the stationary load F is 6.8 kN. All fillets have a 3-mm radius. The shaft is machined from AISI 1050 cold- drawn steel. Estimate the life of the part. Repeat with: working temp T=330 °C, reliability R=90% 30 A ◄ R₁ 10 250 32 B 75 (a) 6.8 kN 38 C 100-125 10->> -35 D R₂ 30

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

Fatigue and Variable Loading
Example 4
In the figure below the shaft is simply supported in ball bearings at A and D.
The shaft rotates and the stationary load F is 6.8 kN.
All fillets have a 3-mm radius. The shaft is machined from AISI 1050 cold-
drawn steel. Estimate the life of the part.
Repeat with: working temp T=330 °C, reliability R=90%
30
A
R₁
10
250
32
B
75
(a)
6.8 kN
|--100-
38
C
125
10-
-35
D

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Step 1: step 1 calculating R1 and R2 , bending stress at B

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Step 2: step 2- fatigue stress correlation for bending, uncorrected endurance limit surface finish factor

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Step 3: step 3 calculating size factor, load factor, corrected endurance limit

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Step 4: step 4

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Step 5: step 5- life of the part

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