Fully-integrated Shell Element QBAT

QBAT is a fully-integrated shell element based on the general formulation described above. In the surface of each element, 4 Gauss points are used to evaluate the nodal forces.

The main modifications with respect to Q4 γ 24 shell element 2 are:
  • Reduced integration for in-plane shear (constant) to avoid locking.
  • Co-rotational coordinate system is used and the stresses are evaluated in 4 local systems at each Gauss points.