Griffith's theory of fracture is primarily applicable to:
Analysis & Theory
Griffith's theory is best suited for explaining fracture in brittle materials like glass and ceramics.
According to Griffith, failure in brittle materials begins due to:
C
Microscopic flaws or cracks
Analysis & Theory
Griffith proposed that microscopic cracks are the root cause of failure in brittle materials.
Which energy balance is central to Griffith’s theory?
A
Thermal vs. kinetic energy
B
Elastic strain energy vs. surface energy
D
Plastic vs. fracture energy
Analysis & Theory
Fracture occurs when the elastic strain energy released is equal to the energy needed to create new crack surfaces.
The critical fracture stress in Griffith’s theory is:
A
Directly proportional to crack length
B
Inversely proportional to square root of crack length
C
Independent of crack length
D
Proportional to material density
Analysis & Theory
The critical fracture stress is inversely proportional to the square root of crack length (σ ∝ 1/√a).
In Griffith’s equation, the variable ‘γ’ represents:
Analysis & Theory
‘γ’ is the surface energy per unit area required to create new crack surfaces.
Which of the following factors does NOT influence fracture according to Griffith?
Analysis & Theory
Yield strength is not a parameter in Griffith’s theory; it focuses on energy terms and crack size.
What role does Young’s modulus play in Griffith’s theory?
A
Represents material toughness
B
Measures surface energy
C
Determines elastic energy stored
D
Controls plastic deformation
Analysis & Theory
Young’s modulus appears in Griffith’s equation as it affects the amount of stored elastic strain energy.
Why is actual fracture strength lower than theoretical strength?
C
Internal flaws or microcracks
Analysis & Theory
Due to internal flaws, the material fails at lower stresses than predicted by theory.
Griffith's theory helps in predicting:
A
Elastic modulus of materials
C
Fracture strength of brittle solids
Analysis & Theory
Griffith’s model helps estimate the stress at which brittle materials fracture.
Which field of study benefits most from Griffith’s theory?
Analysis & Theory
Griffith’s theory laid the foundation for modern fracture mechanics.