QUESTION 18 Ceramics cannot deform plastically because of the absence of QUESTIO

Question

QUESTION 18 Ceramics cannot deform plastically because of the absence of QUESTION 19 Fatigue of metal alloys may be considered to correspond to o the ductile fracture of the alloy after a number of cycles above the yield strength O the brittle fracture of the alloy after a number of cycles above the yield strength O the ductile fracture of the alloy after a number of cycles below the yield strength O the brittle fracture of the alloy after a number of cycles below the yield strength QUESTION 20 A fine grained material is O harder than a one that is coarse grained O stronger than a one that is coarse grained O harder and stronger than a one that is coarse grained O has a lower yield strength than a one that is coarse grained

Explanation / Answer

Ans 18 : non directional bonds

Ceramics cannot deform plastically because of the absence of non directional bonds.

For the material to deform plastically , it must possess non directional bonds. Since ceramics have directional bonds in them which orient in one particular way or break , they cannot be deformed plastically.

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