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For plane stress or plane strain, the element stiffness matrix can be obtained by taking _____

(a) Shape functions, N

(b) Material property matrix, D

(c) Iso parametric representation, u

(d) Degrees of freedom, DoF

I had been asked this question during an interview.

Query is from Two Dimensional Problems in chapter Two Dimensional Problems using Constant Strain Triangles of Finite Element Method

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Best answer
Right choice is (b) Material property matrix, D

The explanation is: The material property matrix is represented as ratio of stress to strain that is σ=Dε . Therefore by this relation element stiffness matrix can be obtained by material property matrix.

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