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.
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.
