The 3 dimensional solid element library in ls-dyna includes 4-noded tetrahedrons, 6-noded pentahedrons, and 8-noded hexahedrons. Depending on the formulation solid elements can have either the standard three translational degrees of freedom per node, or six degrees of freedom (three translations and three rotations) per node needed for full compatibility with beam and shell elements. The connection between constituent nodes is defined with the *ELEMENT_SOLID keyword, while nodal locations are defined with the *NODE keyword. The *SECTION_SOLID keyword is used to choose element formulation. The solid elements in this truck model use one of the following two formulations: constant stress solid element (elform=1) is used for all rigid type behavior, and fully integrated S/R solids are used elsewhere (elform=2).