Question
At yield point of a test piece, the material ________.
The correct answer is
undergoes plastic deformation
Yield Point Material Behavior Explained
The yield point is a critical stress level in a material's response to applied force. Understanding behavior at this point is key in material science.
Understanding Material Response
Material behavior under stress can be broadly categorized:
- Elastic Deformation: Temporary change in shape that is fully recovered when the load is removed. This occurs below the yield point. Hooke's law typically describes this region.
- Plastic Deformation: Permanent change in shape that remains even after the load is removed. This begins at or after the yield point.
Analysis of Options at Yield Point
- Option 1 & 2: Obeys Hooke's law and behaves elastically occur before the yield point.
- Option 3: Regaining original shape is the definition of elastic behavior, which ends at the yield point.
- Option 4: At the yield point, the material's internal structure begins to change permanently, initiating plastic deformation.
Conclusion on Yield Point
Therefore, at the yield point, the material transitions from elastic to plastic behavior and starts to undergo plastic deformation.
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Important Questions from Stress-Strain Diagram
The property of a material which absorb large amount of energy prior to fracture is _______.
True stress experienced by a material is_______ than the engineering stress at a given load.
Strain hardening
True stress at fracture ______ during tensile testing.
In the stress-strain diagram for cast iron, this relationship is correct:
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