Brittle Fracture VS Ductile Fracture

Brittle Fracture:

• Caused due to high impact blows on the material
• Plastic deformation is zero or very very less
• Once crack is formed,  the crack is unstable in nature and propagates very rapidly.
• Crack propagates nearly perpendicular to the direction of the applied stress
• Crack often propagates by cleavage - breaking of atomic bonds along specific crystallographic planes (cleavage planes).

Ductile Fracture:

• Caused due to tensile forces acting on the material
• Necking can be observed i.e. excessive plastic deformation takes place
• Crack is stable i.e. once crack is formed, it resists propagation unless further stress is applied
• Micro-voids are formed fist, then by shear forces the crack propagates and results in fracture

Good material about about Fractures is available here & here

Don't forget to grab a copy of Material Science and Engineering book, which is essential for preparing for AMIE, Material Science.

with warm regards

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