The NBS (nodal based strain) solver option is now available in AUTODYN and the Explicit Dynamics System for tetrahedra filled with ductile materials. The advantage of the NBS tetrahedra over the Average Nodal Pressure (ANP) tetrahedra is that it can avoid shear locking. In AUTODYN, the NBS solver can be specified on a part by part basis under the Parts>Solver menu. Additionally, a non-zero PUSO stability coefficient is used by default to prevent models from exhibiting spurious low energy modes. In the Explicit Dynamics System, the choice of solver for tetrahedra is a global option which is set in Analysis Settings.