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Consider following statements about low cycle and high cycle fatigue:
1. Low cycle fatigue corresponds to stress cycle less than 1000.
2. High cycle fatigue corresponds to stress cycle more than 10000.
3. The machine components such as springs, ball bearings, gears etc. are subjected to high cycle fatigue.
4. A greater factor of safety is taken in low cycle fatigue to ignore the fatigue effect.
Which of the above statements are valid?
  • a)
    1,2, 3 and 4
  • b)
    2, 3 and 4
  • c)
    1,3 and 4
  • d)
    1 and 3
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Consider following statements about low cycle and high cycle fatigue:1...
Low cycle fatigue: stress cycles < 103
High cycle fatigue: stress cycles > 103
Example of low cycle fatigue: studs on truck wheels, failure of set screws for locating gears on shafts, short-lived device such as missile Example of high cycle fatigue: springs, gears, ball bearings
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Most Upvoted Answer
Consider following statements about low cycle and high cycle fatigue:1...
Low cycle and high cycle fatigue:
Low cycle and high cycle fatigue are two types of fatigue failure that occur in materials subjected to cyclic loading. These failures can lead to catastrophic consequences if not properly addressed. Let's analyze each statement to determine which ones are valid.

1. Low cycle fatigue corresponds to stress cycle less than 1000:
This statement is valid. Low cycle fatigue refers to fatigue failure that occurs at a relatively small number of stress cycles, typically less than 1000. The cyclic loading causes significant plastic deformation, leading to the initiation and propagation of cracks. This type of fatigue failure is commonly observed in materials subjected to high-stress levels.

2. High cycle fatigue corresponds to stress cycle more than 10000:
This statement is not valid. High cycle fatigue refers to fatigue failure that occurs at a large number of stress cycles, typically greater than 10^4 (10,000). This type of fatigue failure is characterized by the initiation and propagation of cracks, which are typically small and grow slowly over time. High cycle fatigue is commonly observed in materials subjected to low-stress levels.

3. The machine components such as springs, ball bearings, gears etc. are subjected to high cycle fatigue:
This statement is valid. Machine components such as springs, ball bearings, gears, and other rotating or reciprocating parts are often subjected to high cycle fatigue. These components experience repeated loading and unloading during their operation, leading to fatigue failure over time. It is important to consider the fatigue strength of these components when designing and selecting materials to ensure their reliability and longevity.

4. A greater factor of safety is taken in low cycle fatigue to ignore the fatigue effect:
This statement is valid. In low cycle fatigue, where the number of stress cycles is relatively small, a greater factor of safety is typically applied to account for the reduced fatigue life. The higher factor of safety helps to compensate for uncertainties in loading conditions, material properties, and other factors that can influence the fatigue life. By incorporating a higher factor of safety, the design aims to ignore or minimize the effects of fatigue on the component's performance.

Conclusion:
Based on the analysis, the valid statements regarding low cycle and high cycle fatigue are:
- Low cycle fatigue corresponds to stress cycle less than 1000.
- The machine components such as springs, ball bearings, gears, etc. are subjected to high cycle fatigue.
- A greater factor of safety is taken in low cycle fatigue to ignore the fatigue effect.
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Consider following statements about low cycle and high cycle fatigue:1. Low cycle fatigue corresponds to stress cycle less than 1000.2. High cycle fatigue corresponds to stress cycle more than 10000.3. The machine components such as springs, ball bearings, gears etc. are subjected to high cycle fatigue.4. A greater factor of safety is taken in low cycle fatigue to ignore the fatigue effect.Which of the above statements are valid?a)1,2, 3 and 4b)2, 3 and 4c)1,3 and 4d)1 and 3Correct answer is option 'C'. Can you explain this answer?
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Consider following statements about low cycle and high cycle fatigue:1. Low cycle fatigue corresponds to stress cycle less than 1000.2. High cycle fatigue corresponds to stress cycle more than 10000.3. The machine components such as springs, ball bearings, gears etc. are subjected to high cycle fatigue.4. A greater factor of safety is taken in low cycle fatigue to ignore the fatigue effect.Which of the above statements are valid?a)1,2, 3 and 4b)2, 3 and 4c)1,3 and 4d)1 and 3Correct answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Consider following statements about low cycle and high cycle fatigue:1. Low cycle fatigue corresponds to stress cycle less than 1000.2. High cycle fatigue corresponds to stress cycle more than 10000.3. The machine components such as springs, ball bearings, gears etc. are subjected to high cycle fatigue.4. A greater factor of safety is taken in low cycle fatigue to ignore the fatigue effect.Which of the above statements are valid?a)1,2, 3 and 4b)2, 3 and 4c)1,3 and 4d)1 and 3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider following statements about low cycle and high cycle fatigue:1. Low cycle fatigue corresponds to stress cycle less than 1000.2. High cycle fatigue corresponds to stress cycle more than 10000.3. The machine components such as springs, ball bearings, gears etc. are subjected to high cycle fatigue.4. A greater factor of safety is taken in low cycle fatigue to ignore the fatigue effect.Which of the above statements are valid?a)1,2, 3 and 4b)2, 3 and 4c)1,3 and 4d)1 and 3Correct answer is option 'C'. Can you explain this answer?.
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