Question
Download Solution PDFWhich of the following is the property of a material by virtue of which strain increases with time at constant load?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Creep:
Materials subjected to constant load at an elevated temperature (> 0.4 - 0.5 times of Melting Temperature) will Creep i.e exhibit time dependant deformation. It occurs in three stages.
Stages of Creep:
|
Primary Creep |
Secondary Creep |
Tertiary Creep |
|
Creep rate decreases with time (decreasing slope) due to the strain hardening process resulting from deformation. |
Creep rate becomes linear (Constant slope) There is a balance between strain hardening and recovery (softening) of the material because of recrystallization. |
Creep rate increases with time (Increasing slope) leading to necking and finally fracture because of the structural changes occurring in the material. |
Important Points
Factor affecting Creep:
- Material Properties (Melting point, Young’s Modulus, Grain size)
- Exposure time
- Exposure temperature
- Structural load
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