The shell elements used in the truck model are either
quadrilaterals with four corner nodes, or triangles with
three corner nodes having six degrees of freedom (three
translations and three rotations) per node. The connection
between constituent nodes is defined with the *ELEMENT_SHELL
keyword, while nodal locations are defined with the *NODE
keyword. The *SECTION_SHELL keyword is used to assign section
properties and choose element formulation. The shell elements
in this truck model use one of the following three formulations:
Belytschko-Tsay (elform=2), S/R co-rotational Hughes-Liu
(elform=7), and the fully integrated shell element (elform=16).
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