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Consider the following statements
1. Endurance strength of a component is not affected by its surface finish and notch sensitivity of the material.
2. For ferrous materials like steel, S-N curve becomes asymptotic at cycles.
Which of the statements given above is/are correct?
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Consider the following statements1. Endurance strength of a component...
Statement 1 is wrong, as the endurance strength is affected by its surface finish and notch sensitivity.
⇒If surface finish is poor, then endurance strength will decrease.
⇒If notch sensitivity(q) increases, then it will increase the fatigue stress concentration factor(kf) which will decrease the endurance strength.
Most Upvoted Answer
Consider the following statements1. Endurance strength of a component...
Statement 1: Endurance strength of a component is not affected by its surface finish and notch sensitivity of the material.
The endurance strength of a component refers to its ability to withstand cyclic loading without failure. This strength is typically represented by an S-N curve, which plots the stress amplitude (S) against the number of cycles to failure (N).
Surface finish refers to the quality of the surface of a component. It includes factors such as roughness, machining marks, and surface defects. Notch sensitivity, on the other hand, refers to the susceptibility of a material to stress concentration at a notch or a defect.
Both surface finish and notch sensitivity can have an impact on the fatigue strength of a material. A rough surface or surface defects can act as stress raisers, leading to localized stress concentrations and reduced fatigue strength. Similarly, materials with high notch sensitivity are more prone to stress concentration and lower fatigue strength.
Therefore, statement 1 is incorrect. The surface finish and notch sensitivity of a material can indeed affect its endurance strength.
Statement 2: For ferrous materials like steel, S-N curve becomes asymptotic at cycles.
The S-N curve for a material represents the relationship between the stress amplitude and the number of cycles to failure. It provides information about the fatigue behavior of the material.
In the case of ferrous materials like steel, the S-N curve typically exhibits an endurance limit, also known as the fatigue limit. The endurance limit represents the stress amplitude below which the material can withstand an infinite number of cycles without failure. Beyond the endurance limit, the S-N curve becomes asymptotic, indicating that the material will eventually fail regardless of the stress amplitude.
Therefore, statement 2 is correct. For ferrous materials like steel, the S-N curve becomes asymptotic at cycles.
In conclusion, the correct answer is option B, which states that only statement 2 is correct. The endurance strength of a component is indeed affected by its surface finish and the notch sensitivity of the material. For ferrous materials like steel, the S-N curve becomes asymptotic at cycles.
The endurance strength of a component refers to its ability to withstand cyclic loading without failure. This strength is typically represented by an S-N curve, which plots the stress amplitude (S) against the number of cycles to failure (N).
Surface finish refers to the quality of the surface of a component. It includes factors such as roughness, machining marks, and surface defects. Notch sensitivity, on the other hand, refers to the susceptibility of a material to stress concentration at a notch or a defect.
Both surface finish and notch sensitivity can have an impact on the fatigue strength of a material. A rough surface or surface defects can act as stress raisers, leading to localized stress concentrations and reduced fatigue strength. Similarly, materials with high notch sensitivity are more prone to stress concentration and lower fatigue strength.
Therefore, statement 1 is incorrect. The surface finish and notch sensitivity of a material can indeed affect its endurance strength.
Statement 2: For ferrous materials like steel, S-N curve becomes asymptotic at cycles.
The S-N curve for a material represents the relationship between the stress amplitude and the number of cycles to failure. It provides information about the fatigue behavior of the material.
In the case of ferrous materials like steel, the S-N curve typically exhibits an endurance limit, also known as the fatigue limit. The endurance limit represents the stress amplitude below which the material can withstand an infinite number of cycles without failure. Beyond the endurance limit, the S-N curve becomes asymptotic, indicating that the material will eventually fail regardless of the stress amplitude.
Therefore, statement 2 is correct. For ferrous materials like steel, the S-N curve becomes asymptotic at cycles.
In conclusion, the correct answer is option B, which states that only statement 2 is correct. The endurance strength of a component is indeed affected by its surface finish and the notch sensitivity of the material. For ferrous materials like steel, the S-N curve becomes asymptotic at cycles.
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Consider the following statements1. Endurance strength of a component is not affected by its surface finish and notch sensitivity of the material.2. For ferrous materials like steel, S-N curve becomes asymptotic at cycles.Which of the statements given above is/are correct?a) 1 onlyb) 2 onlyc) Both 1 and 2d) Neither 1 nor 2Correct answer is option 'B'. Can you explain this answer?
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