1) Line joining Syt (yield strength of the material) on mean stress axis and Se (endurance limit of the component) on stress amplitude axis is called as _____
a. Goodman line
b. Soderberg line
c. Gerber line
d. None of the above
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Answer
Explanation
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ANSWER: Soderberg line
Explanation:
No explanation is available for this question!
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2) Notch sensitivity (q) is given by the equation _______
where Kf = fatigue stress concentration factor and Kt = theoretical stress concentration factor
a. ( K f + 1 ) / ( K t – 1 )
b. ( K f – 1 ) / ( K t – 1 )
c. ( K f + 1 ) / ( K t + 1 )
d. ( K f - 1 ) / ( K t + 1 )
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Answer
Explanation
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ANSWER: ( Kf – 1 ) / ( Kt – 1 )
Explanation:
No explanation is available for this question!
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3) Which of the following conditions is true for repeated stress?
1. σm = 0
2. σm = σmax / 2
3. σm = σa
4. σmin = 0
5. σmin = – σmax
6. σa = σmax / 2
where σm = mean stress and σa = stress amplitude
a. condition 2 and 3
b. condition 1, 3 and 5
c. condition 2, 4, and 6
d. condition 3,4, 5 and 6
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Answer
Explanation
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ANSWER: condition 2, 4, and 6
Explanation:
No explanation is available for this question!
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4) In S-N diagram, the graph plotted between fatigue strength and number of stress cycles becomes horizontal for which type of materials?
a. Ferrous materials
b. Non-ferrous materials
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: Ferrous materials
Explanation:
No explanation is available for this question!
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5) 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
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
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Answer
Explanation
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ANSWER: 1 – C, 2 – A, 3 – D, 4 – B
Explanation:
No explanation is available for this question!
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6) Which of the following equations is correct for Soderberg Criteria?
a. (σ m / S ut) + (σ a / S e) = (1 / N f)
b. (σ m / S ut) - (σ a / S e) = (1 / N f)
c. (σ m / S yt) + (σ a / S e) = (1 / N f)
d. (σ m / S ut) - (σ a / S e) = (1 / N f)
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Answer
Explanation
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ANSWER: (σm / Syt) + (σa / Se) = (1 / Nf)
Explanation:
No explanation is available for this question!
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7) Calculate fatigue stress concentration factor, when theoretical stress concentration factor is 1.62 and notch sensitivity is equal to 0.9
a. 1.558
b. 3.358
c. 1.162
d. None of the above
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Answer
Explanation
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ANSWER: 1.558
Explanation:
No explanation is available for this question!
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8) According to Modified Goodman Diagram for fluctuating torsional shear stress, which line defines fatigue failure?
a. Line joining point S ys on mean stress and stress amplitude
b. Horizontal line QR at point S es on stress amplitude
c. Polyline STRQ defines fatigue failure
d. None of the above
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Answer
Explanation
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ANSWER: Horizontal line QR at point Ses on stress amplitude
Explanation:
No explanation is available for this question!
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9) In diagram shown below, what does angle θ correspond to?
a. It corresponds to actual stress point
b. It corresponds to point of intersection of fatigue failure line and static failure line
c. It corresponds to actual strain point
d. None of the above
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Answer
Explanation
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ANSWER: It corresponds to actual stress point
Explanation:
No explanation is available for this question!
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10) To predict failure in design components which failure criteria is not assumed, when mean stress and stress amplitude are nonzero?
a. Goodman criterion
b. Soderberg criteria
c. Gerber criteria
d. None of the above
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Answer
Explanation
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ANSWER: None of the above
Explanation:
No explanation is available for this question!
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