Question

Griffith theory is applicable for

• A. Perfect brittle materials
• B. All ductile materials
• C. Perfect ductile materials
• D. All materials

Hint:

Griffith theory is based on energy balance and is valid only for brittle materials with negligible plastic deformation.

Answer 1

The Correct Option is A

Step 1: Understanding Griffith’s theory.
Griffith’s theory of fracture explains crack propagation based on energy balance. It assumes that materials fracture without plastic deformation.
Step 2: Assumptions of the theory.
The theory assumes elastic behavior up to fracture and neglects plastic deformation at the crack tip. These assumptions hold true only for brittle materials.
Step 3: Elimination of other options.
Ductile materials undergo significant plastic deformation before fracture, which violates the assumptions of Griffith’s theory. Hence, it is not applicable to ductile or all materials.
Step 4: Conclusion.
Griffith’s theory is applicable only to perfect brittle materials.