degrees of freedom in solid
degrees of freedom in solid
(OP)
Hi friends,
I have just started learning fea.
I have a basic fea question.
My question is why there are 3 degrees of freedom in solid. Why there are no rotational degrees of freedom in 3D elements unlike in 2D elements.
I have just started learning fea.
I have a basic fea question.
My question is why there are 3 degrees of freedom in solid. Why there are no rotational degrees of freedom in 3D elements unlike in 2D elements.





RE: degrees of freedom in solid
corus
RE: degrees of freedom in solid
RE: degrees of freedom in solid
Formulation of elements with rotational dofs are more complicated than traditional elements, because you have to maintain continuity of the displacements and their derivatives. Ansys had a solid element with 6 dofs some time ago, the formulation was based on a hybrid of stresses.
RE: degrees of freedom in solid
RE: degrees of freedom in solid
The type of the DOFs (traslational, rotational , temperature etc.) contained in element formulation has little to do with the element dimensionality (2D, 3D) but rather depends on the underlying theory the element formulation is derived from.
I suspect you used a structural element type for your 2D model and a solid continuum element type for the 3D model.