Tie constraints

Discussion related to the textbook "Finite Element Analysis of Composite Materials" and Abaqus in general.
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turbin

Tie constraints

Post by turbin »

Hello,
In example 6.3 it is shown how to use tie constraints to emulate periodic boundary conditions and calculte shear modulus 13.
However, my try to imply the same technique for pure shear in 12
and 23 evolved in the eliminating degrees of freedom of
adjustent nodes to constrained surfaces and blocking boundary conditions.
In fact, I really wonder, how this effect didn't work shear 13, because there no elimination happened.
Can anyone suggest me something to fix this elimination or/and explain, why the elimination didn't happen in 6.3?

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