The ELEMENT TYPE indicator card is used to announce the data for the different types of nonlinear elements to be used. The names of the elemental and, optionally, internal variables and parameters for each element type are specified in this section. The syntax for data cards following the indicator card is given in Figure 3.16.
The string in field 1 may be one of EV, IV or EP. This indicates whether the names of elemental variables (EV), internal variables (IV) or elemental parameters (EP) are to be specified on the given data card. If no cards with the string IV in field 1 are found for a particular element type, the element is assumed to have no useful internal variables; the internal variables are then allocated the same names as the elemental ones. Likewise, if no cards with the string EP in field 1 are found for a particular element type, the element is assumed not to depend on parameter values.
The string etype-name in data field 2 gives the name of the element type under consideration. This name may be up to ten characters long. The data for a particular element must be specified on consecutive data cards.
The strings in data fields 3 and (optionally) 5 give the names of elemental variables (field 1 EV), internal variables (field 1 IV) or parameters (field 1 EP) for the element type specified in field 2. These strings must be valid Fortran names (see Section 3.1.2). The names of the variables for different element types may be the same; the names of the elemental variables, internal variables and parameters (if the latter two are given) for a specific element type must all be different.