S4 Four Node Shell Element The S4 shell element uses Mindlin plate element combined with GQ12 element. Number of Nodes: 4 Number of DoFs: 6 (Translation, Translation, Translation, Rotation, Rotation, Rotation) Syntax Text Only1 2 3 4 5element S4 (1) (2...5) (6) (7) # (1) int, unique element tag # (2...5) int, node i, j, k, l # (6) int, material tag # (7) double, thickness