A spring element may be defined by the properties of Stiffness, Damping Coefficient and Stress Coefficient. This is associated with the Nastran PELAS card, which is used in conjunction with the CELAS1 and CELAS3 element connectivity cards.
Select LS-DYNA Material as either Type 66 or Type 74.
Note: It is customary to define spring elements for each degree of freedom separately. For a six degree of freedom bushing, you need to define 6 CELAS1 and 6 corresponding PELAS cards. Also, spring elements should be defined by coincident nodes (zero length) so that they don’t transfer unintended moments.