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Question p.6.9: It is required to form the stiffness matrix of a triangular ...

It is required to form the stiffness matrix of a triangular element 123 for use in stress analysis problems. The coordinates of the element are (1, 1), (2, 1), and (2, 2), respectively.
(a) Assume a suitable displacement field explaining the reasons for your choice.
(b) Form the [B] matrix.
(c) Form the matrix which gives, when multiplied by the element nodal displacements, the stresses in the element. Assume a general [D] matrix.

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