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!ELEMENT¶

Definition of elements

1st line

!ELEMENT, TYPE=<type> [, optional parameter]

Parameter
`TYPE`	Element type (required)
`EGRP`	Element group name (optional)
`MATITEM`	Number of material-property items when material properties are defined for each element
	(Not used when material properties are defined for each section)
`INPUT`	External file name (optional)

Parameter name	Parameter value	Description
TYPE	111	Rod/link element (first order)
	231	Triangular element (first order)
	232	Triangular element (second order)
	241	Quadrilateral element (first order)
	242	Quadrilateral element (second order)
	301	Truss element (first order)
	341	Tetrahedral element (first order)
	342	Tetrahedral element (second order)
	351	Pentahedral element (first order)
	352	Pentahedral element (second order)
	361	Hexahedral element (first order)
	362	Hexahedral element (second order)
	511	Connector element (for springs and dashpots, 2 nodes, first order)
	541	Interface element (quadrilateral cross section, first order)
	611	Beam element (first order)
	641	Beam element (first order, using four 3-DOF nodes)
	731	Triangular shell element (first order)
	741	Quadrilateral shell element (first order)
	743	Quadrilateral shell element (second order)
	761	Triangular shell element (first order, using six 3-DOF nodes)
	781	Quadrilateral shell element (first order, using eight 3-DOF nodes)
`EGRP`	<egrp>	Element group name (optional)
`INPUT`	<filename>	External file name (optional); may also be used together with the 2nd and subsequent lines

2nd line and subsequent lines

(2nd line) ELEM_ID, nod1, nod2, nod3, ..., MAT1, MAT2, ...

(Same for subsequent lines)

Variable name	Attribute	Description
ELEM_ID	I	Element ID
nodX	I	Connectivity
MATy	R	Material property value for each element

Notes

For details of element types and connectivity, refer to "Chapter 4 Element Library."
Nodes specified in the connectivity must be defined before !ELEMENT.
Element IDs do not need to be consecutive.
The !ELEMENT option may be defined any number of times.
Element IDs must be positive integers. They cannot be omitted.
If the same element ID is used more than once, the last value entered is used. In this case, a warning message is output.
Undefined nodes cannot be used in connectivity.
A single element definition may span multiple lines.
Element type 511 is a 2-node connector element representing a spring (!SPRING_A / !SPRING_D) or dashpot (!DASHPOT_A / !DASHPOT_D). Specify the two nodes to be connected as the connectivity, and specify TYPE=INTERFACE for the corresponding !SECTION. Spring constants and damping coefficients are specified under !MATERIAL in the analysis control data (cnt).

Example

!ELEMENT, TYPE=231
1, 1, 2, 3
2, 4, 8, 5
4, 6, 7, 8
!ELEMENT, TYPE=361, EGRP=A
101, 101, 102, 122, 121, 201, 202, 222, 221
102, 102, 103, 123, 122, 202, 203, 223, 222
103, 103, 104, 124, 123, 203, 204, 224, 223
!ELEMENT, TYPE=511, EGRP=ESPRING
201, 1, 101
202, 2, 102