Choosing the element type of a mesh | SKILL-LYNC

[@SkillLync]

Guys, A small correction. 3D elements have only 3 DOFS per node.

[@creationmodelling42]

How 3 DOFS shouldn't it be 6?

[@pawanraghav5178]

Yes

[@Arsenic_99]

@@creationmodelling42 That is because we want them have 3 DOF's (only translational) per node in Solid Elements. First and the foremost reason is to actually make the calculations a bit less time consuming and complex. A node having 6 DOF's means that the node is able to resist and transfer forces in 3 DOF's (translational) while moments in other 3 DOF's (rotational). In solid elements, this is not the case. A solid element is not supposed to resist and transmit the moments. That is because in the reality it cannot. The moment transfer happens in terms of equal and opposite forces. Therefore, only 3 DOF's (translational) are enough which are used to resist and transfer forces. However, for a shell and beam element, a node is supposed to carry and resist the moments, thus rotational DOF's are a necessity. But this should be remembered that nothing in reality is 2D and 1D. We are trying to represent the reality in FEM.

[@ajitr28]

Isn’t the 1D beam element has 4dof ?? XY on one node and XY on another ?? (2 translational at 2 each node) Also the 2D element (shell element ) has 4 nodes hence 8 translational and 4 rotational = 12 nodes . And the 3D element has 8 nodes hence 24 translational (3 on each node) and 24 rotational (3 on each node along 3 translational axis) =48

[@piotrstepien2755]

Yes, indeed: 3D solids have 3 dof, 2D: depending on the type (5 or 6 dof).

[@vasantamadhavakulkarni4673]

Please explain how to clear cae tool test for freshers.

[@shashankktshashi3446]

pls explain how to maintain average element size when meshing in hypermesh

[@RaviKumar-ul4zl]

sir if i choose this course means any placements from your side

[@SkillLync]

Ravi Kumar - This is a job leading course and comes with Job assistance!

[@justdrive5287]

What is degrees of freedom in this case?How one can know , that one node has six degrees of freedom?

[@SkillLync]

rahul k - this information generally depends on the type of element. 6 is the maximum number of dofs that are possible, per node. Usually, you can look at the element definition to get this information.

[@justdrive5287]

@@SkillLync Okay, sure will do.

[@ramvelselvarajan1146]

Sir,could you please explain about dof in fem aspect?

[@sudharshanr4997]

Degree of freedom is defined as the minimum number of independent coordinates to represent all possible positions of a node

[@vinodhkumar3459]

Tqqq ❤️👍

[@feaforbegineers4571]

But 3D element has maximum 3 dof

[@creationmodelling42]

How? 3D objects have rotational as well and for 1d object it should be less and as well for 2d objects?

[@sukranochani5764]

thanks a lot sir

[@rajivmicrogenesis3775]

you are wrong on 3d element, in each 3d element has only 3dof not 6