Energy required for deformation - Material Science

Q.  Energy required for deformation can be calculated using the formula
- Published on 05 Aug 15

a. E = L2 G b
b. E = L G b2
c. E = L (Gb)2
d. E = L G b

ANSWER: E = L G b2

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    Discussion

  • Sravanthi   -Posted on 06 Oct 15
    Energy required for deformation can be calculated using the formula E = L g b2
    Here,
    L = length of dislocation line
    b = Burger's vector
    G = Shear modulus
    Burger's vector represents direction and magnitude of lattice distortion which results from dislocation in crystal lattice.
    If shear modulus and Burger's vector are minimum, energy required for deformation is minimum.

    Dislocations having small value of slip vector (b) are easily generated and develop plastic deformation.
    Large displacement occurs in one part of crystal with respect to other part of crystal in the process of deformation by slip. It occurs in slip plane along slip direction. Generally plastic deformation occurs by twinning, slip or both.

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