Infinite element library | |||||||
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ProductsAbaqus/StandardAbaqus/ExplicitAbaqus/CAE
Element types
Plane strain solid continuum infinite elements
- CINPE4
4-node linear, one-way infinite
- CINPE5R(S)
5-node quadratic, one-way infinite
Active degrees of freedom
1, 2
Additional solution variables
None.
Plane stress solid continuum infinite elements
- CINPS4
4-node linear, one-way infinite
- CINPS5R(S)
5-node quadratic, one-way infinite
Active degrees of freedom
1, 2
Additional solution variables
None.
3D solid continuum infinite elements
- CIN3D8
8-node linear, one-way infinite
- CIN3D12R(S)
12-node quadratic, one-way infinite
- CIN3D18R(S)
18-node quadratic, one-way infinite
Active degrees of freedom
1, 2, 3
Additional solution variables
None.
Axisymmetric solid continuum infinite elements
- CINAX4
4-node linear, one-way infinite
- CINAX5R(S)
5-node quadratic, one-way infinite
Active degrees of freedom
1, 2
Additional solution variables
None.
2D acoustic infinite elements
- ACIN2D2
2-node linear, acoustic infinite
- ACIN2D3(S)
3-node quadratic, acoustic infinite
Active degrees of freedom
8
3D acoustic infinite elements
- ACIN3D3
3-node linear, acoustic infinite triangular element
- ACIN3D4
4-node linear, acoustic infinite quadrilateral element
- ACIN3D6(S)
6-node quadratic, acoustic infinite triangular element
- ACIN3D8(S)
8-node quadratic, acoustic infinite quadrilateral element
Active degrees of freedom
8
Axisymmetric acoustic infinite elements
- ACINAX2
2-node linear, acoustic infinite
- ACINAX3(S)
3-node quadratic, acoustic infinite
Active degrees of freedom
8
Nodal coordinates required
Plane stress and plane strain solid continuum elements: X, Y
2D acoustic elements: X, Y
3D solid continuum and acoustic elements: X, Y, Z
Axisymmetric solid continuum and acoustic elements: r, z
Normal directions are not specified at nodes used in acoustic infinite elements; they will be computed automatically. See Infinite elements for details.
Element property definition
For two-dimensional, plane strain, and plane stress elements, you must provide the thickness of the elements; by default, unit thickness is assumed.
For three-dimensional and axisymmetric solid elements, you do not need to specify a thickness.
For acoustic elements, you must specify the reference point in addition to the thickness.
Input File Usage
SOLID SECTION
Abaqus/CAE Usage
Only acoustic infinite sections are supported in Abaqus/CAE.
Property module: Create Section: select Other as the section Category and Acoustic infinite as the section Type
Element-based loading
None.
Element output
Stress, strain, and other tensor components
No output is available from Abaqus/Explicit for infinite elements. Stress and other tensors (including strain tensors) are available from Abaqus/Standard for infinite elements with displacement degrees of freedom. All tensors have the same components. For example, the stress components are as follows:
- S11
direct stress or radial stress for axisymmetric elements.
- S22
direct stress or axial stress for axisymmetric elements.
- S33
direct stress (not available for plane stress elements) or hoop stress for axisymmetric elements.
- S12
shear stress or shear stress for axisymmetric elements.
- S13
shear stress (not available for plane stress, plane strain, and axisymmetric elements).
- S23
shear stress (not available for plane stress, plane strain, and axisymmetric elements).
Node ordering and face numbering on elements
Plane stress and plane strain solid continuum elements
Axisymmetric solid continuum elements
Three-dimensional solid continuum elements
Two-dimensional and axisymmetric acoustic infinite elements
Three-dimensional acoustic infinite elements
Numbering of integration points for output
Plane stress and plane strain solid continuum elements
Axisymmetric solid continuum elements
Three-dimensional solid continuum elements
This shows the scheme in the layer closest to the 1–2–3–4 face. The integration points in the second layer are numbered consecutively.