PLANE223 Element Description

PLANE223 supports the following physics combinations:

The element has eight nodes with up to five degrees of freedom per node.

Structural capabilities include elasticity, plasticity, hyperelasticity, viscoelasticity, viscoplasticity, creep, large strain, large deflection, and stress stiffening effects. It also has mixed formulation capability for simulating deformations of nearly incompressible elastoplastic materials, and fully incompressible hyperelastic materials.

Piezoresistive capabilities include the piezoresistive effect. Piezoelectric capabilities include direct and converse piezoelectric effects. Electrostatic-structural capabilities include electrostatic force coupling. Thermoelectric capabilities include Seebeck, Peltier, and Thomson effects, as well as Joule heating. In addition to thermal expansion, structural-thermal capabilities include the piezocaloric effect in dynamic analyses. The Coriolis effect is available for analyses with structural degrees of freedom. The thermoplastic effect is available for analyses with structural and thermal degrees of freedom.

Thermo-electromagnetic capabilities include eddy current and Joule heating effects for transient analyses. In electromagnetic analyses, all VOLT degrees of freedom must be coupled (CP) in a 2-D electromagnetic region such that the voltage drop across the thickness has a single value. The element has nonlinear magnetic capability for modeling B-H curves or permanent magnet demagnetization curves for static and transient coupled-field analyses.

The diffusion expansion and hydrostatic stress-migration effects are available for analyses with structural and diffusion degrees of freedom. The thermo-migration effect (Soret effect) and the temperature-dependent saturated concentration effect is available for analyses with thermal and diffusion degrees of freedom. The electro-migration effect is available for analyses with electrical and diffusion degrees of freedom.

See PLANE223 in the Mechanical APDL Theory Reference for more details about this element.

Figure 223.1:  PLANE223 Geometry

PLANE223 Input Data

The geometry, node locations, and the coordinate system for this element are shown in Figure 223.1: PLANE223 Geometry. The element input data includes eight nodes and structural, thermal, electrical, and magnetic material properties.

The type of units (MKS or user defined) for electromagnetic problems is specified through the EMUNIT command. EMUNIT also determines the value of free-space permittivity, EPZRO, and free-space permeability, MUZRO. The element input for magnetic material properties is the same as PLANE233; see "PLANE233 Input Data" for details.

KEYOPT(1) determines the element DOF set and the corresponding force labels and reaction solution. KEYOPT(1) is set equal to the sum of the field keys shown in Table 223.1: PLANE223 Field Keys. For example, KEYOPT(1) is set to 11 for a structural-thermal analysis (structural field key + thermal field key = 1 + 10). For a structural-thermal analysis, UX, UY, and TEMP are the DOF labels and force and heat flow are the reaction solution.

The coupled-field analysis KEYOPT(1) settings, DOF labels, force labels, reaction solutions, and analysis types are shown in the following table.

As shown in the following tables, material property requirements consist of those required for the individual fields (structural, thermal, electric conduction, electrostatic, magnetic, or diffusion) and those required for field coupling. Individual material properties are defined via the MP and MPDATA commands. Nonlinear and multiphysics material models are defined via the TB command. (The nonlinear material models do not apply to piezoelectric analyses (TB,PIEZ) where KEYOPT(1) = 1001 or 1011).

Nonlinear orthotropic magnetic properties can be specified with a combination of a B-H curve (TB,BH command) and linear relative permeability. The B-H curve is used in each element coordinate direction where a zero value of relative permeability is specified. Only one B-H curve may be specified per material.

Various combinations of nodal loading are available for this element (depending upon the KEYOPT(1) value). Nodal loads are defined with the D and the F commands. Nodal forces, if any, should be input per unit of depth for a plane analysis and on a full 360° basis for an axisymmetric analysis.

Element loads are described in Nodal Loading. Surface loads may be input on the element faces indicated by the circled numbers in Figure 223.1: PLANE223 Geometry using the SF and SFE commands. Positive pressures act into the element. Body loads may be input at the element's nodes or as a single element value using the BF and BFE commands.

PLANE223 surface and body loads are given in the following table.

Most surface and body loads can be defined as a function of primary variables by using tabular input. For more information, see Applying Loads Using TABLE Type Array Parameters in the Mechanical APDL Basic Analysis Guide and the individual surface or body load command description in the Command Reference.

Automatic element technology selections are given in the following table.

A summary of the element input is given in "PLANE223 Input Summary". A general description of element input is given in Element Input. For axisymmetric applications see Harmonic Axisymmetric Elements.

PLANE223 Output Data

The solution output associated with the element is in two forms:

The element output directions are parallel to the element coordinate system. A general description of solution output is given in Solution Output. See the Basic Analysis Guide for ways to view results.

The Element Output Definitions table uses the following notation:

A colon (:) in the Name column indicates that the item can be accessed by the Component Name method (ETABLE, ESOL). The O column indicates the availability of the items in the file Jobname.OUT. The R column indicates the availability of the items in the results file.

In either the O or R columns, “Y” indicates that the item is always available, a number refers to a table footnote that describes when the item is conditionally available, and “-” indicates that the item is not available.

Table 223.8: PLANE223 Item and Sequence Numbers lists output available through the ETABLE command using the Sequence Number method. See The General Postprocessor (POST1) of the Basic Analysis Guide and The Item and Sequence Number Table in this reference for more information. The following notation is used in Table 223.8: PLANE223 Item and Sequence Numbers:

PLANE223 Assumptions and Restrictions

PLANE223 Product Restrictions

There are no product-specific restrictions for this element.