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A brittle material is mechanically tested in medium P in which it has surface energy γs = 0.9 J m-2. This material has a fracture strength of 300 MPa for a given flaw size. The same solid containing the same flaws is then tested in medium Q in which γs = 0.1 J m-2. The fracture strength (in MPa) in medium Q based on Griffith's theory is
If the surface crack causing fracture in a brittle material is made twice as deep, the fracture strength will
Brittle fracture is a break in a brittle piece of metal that failed because stress exceeds _____
Consider the following statements for ductile fracture: 1. The material undergoes substantial plastic deformation with high energy absorption before fracture. 2. Presence of cracks on the surface of material initiates this type of failure. 3. Fracture occurs due to necking. Which of the above statements is/are correct? 
Brittle fracture needs more energy than the ductile fracture.
The brittle fracture is considered much more severe than ductile fracture.
The Ductile fracture depends strongly on strain rate compared with brittle fracture, which is relatively insensitive to strain rate.
The fracture stress according to Orowan’s theory of brittle fracture is __________ (where E is Yong’s modulus, ϒp is the plastic work required to extend the crack wall of the length 2
Fracture stress for a brittle material having a crack lenght of 1μm is 200 MPa. Fracture stress for the same material having a crack lenght of 4 μm is
Brittle fracture is more dangerous than ductile fracture because