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A test specimen is stressed slightly beyond the yield point and then unloaded. Its yield strength will
- a)Decrease
- b)Increase
- c)Remains same
- d)Becomes equal to ultimate tensile strength
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A test specimen is stressed slightly beyond the yield point and then u...
Increased.because the specimen is strain hardened due to plastic deformation.
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A test specimen is stressed slightly beyond the yield point and then u...
Yield Strength and Yield Point
Yield strength is the amount of stress required to cause a material to deform plastically, meaning it won't return to its original shape when the stress is removed. Yield point is the point at which a material begins to deform plastically, and it is typically slightly lower than the yield strength.
Effect of Stressing Beyond Yield Point and Unloading
When a test specimen is stressed slightly beyond the yield point and then unloaded, its yield strength will increase. This is because the material has undergone some permanent deformation, which rearranges its internal structure and makes it more resistant to further deformation.
Explanation
When a material is stressed beyond its yield point, it undergoes plastic deformation, which means it deforms permanently. This permanent deformation is due to the movement of dislocations, which are defects in the crystal lattice structure of the material. When the load is removed, some of these dislocations remain, and the material becomes stronger and more resistant to further deformation.
As a result, the yield strength of the material increases after it has been stressed beyond its yield point and unloaded. This effect is more pronounced for materials that undergo strain hardening, which is a process by which the material becomes stronger as it is deformed.
Conclusion
In conclusion, when a test specimen is stressed slightly beyond the yield point and then unloaded, its yield strength will increase. This is due to the permanent deformation that occurs during the plastic deformation process, which rearranges the material's internal structure and makes it more resistant to further deformation.
Yield strength is the amount of stress required to cause a material to deform plastically, meaning it won't return to its original shape when the stress is removed. Yield point is the point at which a material begins to deform plastically, and it is typically slightly lower than the yield strength.
Effect of Stressing Beyond Yield Point and Unloading
When a test specimen is stressed slightly beyond the yield point and then unloaded, its yield strength will increase. This is because the material has undergone some permanent deformation, which rearranges its internal structure and makes it more resistant to further deformation.
Explanation
When a material is stressed beyond its yield point, it undergoes plastic deformation, which means it deforms permanently. This permanent deformation is due to the movement of dislocations, which are defects in the crystal lattice structure of the material. When the load is removed, some of these dislocations remain, and the material becomes stronger and more resistant to further deformation.
As a result, the yield strength of the material increases after it has been stressed beyond its yield point and unloaded. This effect is more pronounced for materials that undergo strain hardening, which is a process by which the material becomes stronger as it is deformed.
Conclusion
In conclusion, when a test specimen is stressed slightly beyond the yield point and then unloaded, its yield strength will increase. This is due to the permanent deformation that occurs during the plastic deformation process, which rearranges the material's internal structure and makes it more resistant to further deformation.
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Community Answer
A test specimen is stressed slightly beyond the yield point and then u...
In stress strain curve, after yielding the curve starts to increase
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A test specimen is stressed slightly beyond the yield point and then unloaded. Its yield strength willa)Decreaseb)Increase c)Remains samed)Becomes equal to ultimate tensile strengthCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A test specimen is stressed slightly beyond the yield point and then unloaded. Its yield strength willa)Decreaseb)Increase c)Remains samed)Becomes equal to ultimate tensile strengthCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A test specimen is stressed slightly beyond the yield point and then unloaded. Its yield strength willa)Decreaseb)Increase c)Remains samed)Becomes equal to ultimate tensile strengthCorrect answer is option 'B'. Can you explain this answer?.
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