Question:
"Dislocation lines are not straight but rather dislocation lines are flexible" is given by
"Dislocation lines are not straight but rather dislocation lines are flexible" is given by
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Frank–Read source is fundamental to understanding plastic deformation in crystals.
Updated On: Jun 29, 2026
- Mott and Nabarro
- Taylor and Quinney
- Frank and Read
- Cottrell and Bilby
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The Correct Option is C
Solution and Explanation
Concept:
Dislocations in crystals behave like flexible elastic strings. This concept is explained by the Frank–Read source mechanism.
Step 1: Frank–Read source mechanism.
A dislocation segment pinned at two points:
• bows under applied shear stress
• expands into a loop
• generates new dislocations This proves dislocation lines are flexible and not rigid.
Step 2: Physical implication.
Flexibility allows:
• multiplication of dislocations
• plastic deformation Final Answer: \[ \boxed{\text{Frank and Read}} \]
Step 1: Frank–Read source mechanism.
A dislocation segment pinned at two points:
• bows under applied shear stress
• expands into a loop
• generates new dislocations This proves dislocation lines are flexible and not rigid.
Step 2: Physical implication.
Flexibility allows:
• multiplication of dislocations
• plastic deformation Final Answer: \[ \boxed{\text{Frank and Read}} \]
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