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Why 3D elements have only 3 Degrees of freedom?

User: "Altair Forum User"
Altair Forum User
Altair Employee
Updated by Altair Forum User

Sir,

 

     Why 3D elements have only 3 Degrees of freedom? I referred our Book- Practical Aspects FEA, they say 'after rod (1D), paper (2D), imagin a (wooden) duster (3D), can you EASILY twist it?,.... Hence only 3 d.o.f.s NO ROTATIONAL D.O.F.s '

My query is 'what about a solid ductile metal duster tested with a torsion tester (now not to worry about the capacity)?' Now what if it  could twist EASILY?

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