Characterization of Cup & cone formation - Material Science

Q.  Which of the following statements is/are true?
- Published on 05 Aug 15

a. In tensile specimens necking is observed in brittle fractures
b. Cup and cone formation characterizes ductile fractures
c. Stress in brittle fractures increases during cracking
d. All the above

ANSWER: Cup and cone formation characterizes ductile fractures

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    Discussion

  • Sravanthi   -Posted on 06 Oct 15
    Brittle fractures are observed in cast irons. This type of fracture is flat, granular and has rough surface. Brittle fractures occur due to rapid crack propagation and slight plastic deformation which relatively show flat fracture surface. Crack propagation in brittle materials corresponds to successive and repeated breaking of atomic bonds and this occurs along specific crystalline planes. This process is known as cleavage.

    Ductile fractures are characterized by cup and cone formation. These ductile cracks involve substantial plastic flow and ductile fractures have rough fractured surfaces. Plastic strain causes microvoids in metals at the sites of inclusion. These microvoids later join together as process proceeds. When wall between growing voids brake, failure occurs.

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