how to find out the order of the stiffness matrix? 1

[mageshk]

Please let me know whether the following is correct:
order of the stiffness matrix = (no. of nodes) * (degrees of freedom per node)

 

[zuardy]

yup, but you must be aware that this is valid only for a stucture build with one type of elements. Generally it must be look like:
order of K = Sum (node(i) * DOFs of node(i))
with i = 1...n (number of nodes)
any comments?

cheers

 

[mageshk]

Thanks for the reply

 

[brad]

In a general sense, this is correct. However, many codes have elements which also contain additional internal dof's which are associated with the elements, but which increase the dof count significantly. (Incompatible modes elements are one such element).

Brad