Question

define elastic constant​

Answer 1

Answer:

Elastic constants are the parameters expressing the relation between the stress and the strain on the materials within the stress range that the materials exhibit elastic behavior

Answer 2

Answer:

Elastic constant measures proportionality between a strain and stress in a crystal, provided that the strain is not so large to violate hook's law.

Computationally,the elastic constant is determined by applying a strain to a crystal , measuring the energy versus strain and determining the elastic constant from the curvature of the function at zero strain.A given strain is associated with a certain linear combination or elastic constant. For cubic systems, including diamond, there are three independent elastic constants C11,C12 and C44. One linear combination of the elastic constants is obtained from the bulk modulus.

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