Notations of endurance limit modifying factors

Q.  Match the following Group 1 items with Group 2 items and select the correct option

1. Size factor ----------------------------------------- A. Kc
2. Load factor ---------------------------------------- B. Kg
3. Temperature factor ------------------------------- C. Kb
4. Reliability factor --------------------------------- D. Kd

- Published on 14 Sep 15

a. 1 – B, 2 – A, 3 – D, 4 – C
b. 1 – C, 2 – A, 3 – D, 4 – B
c. 1 – D, 2 – B, 3 – A, 4 – C
d. 1 – D, 2 – C, 3 – A, 4 – B

ANSWER: 1 – C, 2 – A, 3 – D, 4 – B

Discussion

• Sravanthi   -Posted on 03 Nov 15
- The endurance limit of a mechanical component differs from from test specimen due to standard working conditions.

- Endurance limit: The maximum value of completely reversed stress which a standard test specimen can withstand for infinite cycles is called as endurance limit.

- The endurance limit of any mechanical component is calculated by considering modifying factors and endurance limit of test specimen.

- Therefore, endurance limit (Se) = Ka Kb Kc Kd Ke Kg Se'

here, Se' = endurance limit of test specimen

Ka = surface finish factor, Kb = size factor, Kc = load factor, Kd = temperature factor, Ke = modifying factor for stress, Kg = reliability factor

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