Question:
The sensitivity of fracture of brittle solids to surface conditions is termed as the
The sensitivity of fracture of brittle solids to surface conditions is termed as the
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Brittle fracture strength is controlled by surface flaws, not bulk strength.
Updated On: Jun 29, 2026
- Hall-Petch effect
- Joffe effect
- Bauschinger effect
- Portevin-Le Chatelier effect
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The Correct Option is B
Solution and Explanation
Concept:
In brittle materials, fracture strength is highly sensitive to surface flaws such as scratches, cracks, and micro-defects. This phenomenon is known as the Joffe effect.
Step 1: Understand brittle fracture behavior.
Brittle solids fail due to crack propagation, and surface defects act as stress concentrators.
Step 2: Define Joffe effect.
The Joffe effect states that: \[ \text{fracture strength of brittle solids depends strongly on surface condition} \] Even minor surface damage drastically reduces strength.
Step 3: Evaluate other effects.
• Hall-Petch → grain size strengthening
• Bauschinger → reverse loading plasticity
• PLC effect → serrated yielding Final Answer: \[ \boxed{\text{Joffe effect}} \]
Step 1: Understand brittle fracture behavior.
Brittle solids fail due to crack propagation, and surface defects act as stress concentrators.
Step 2: Define Joffe effect.
The Joffe effect states that: \[ \text{fracture strength of brittle solids depends strongly on surface condition} \] Even minor surface damage drastically reduces strength.
Step 3: Evaluate other effects.
• Hall-Petch → grain size strengthening
• Bauschinger → reverse loading plasticity
• PLC effect → serrated yielding Final Answer: \[ \boxed{\text{Joffe effect}} \]
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