SECTYPE, SECID
, Type
, Subtype
, Name
, REFINEKEY
Associates section type information with a section ID
number.
SECID
Section identification number.
If SECID
is blank or zero, the SECID
number is incremented by one from the highest
section ID number currently defined in the database. (See Notes for SECID
input specific to general contact.)
Type
BEAM | — | Defines a beam section. |
TAPER | — | Defines a tapered beam or pipe section. The sections at the end points must be topologically identical. |
GENB | — | Defines a nonlinear general (temperature-dependent) beam section. |
COMB | — | Defines a composite (temperature-dependent) beam section. |
PIPE | — | Defines a pipe section. |
LINK | — | Defines a link section. |
AXIS | — | Define the axis for a general axisymmetric section. |
SHELL | — | Defines a shell section. |
GENS | — | Defines a preintegrated general (temperature-dependent) shell section. |
PRETENSION | — | Defines a pretension section. |
JOINT | — | Defines a joint section. |
REINF | — | Defines a reinforcing section. |
CONTACT | — | Defines a contact section. |
Subtype
When Type
= BEAM, the possible
beam sections that can be defined for Subtype
are:
RECT | Rectangle |
QUAD | Quadrilateral |
CSOLID | Circular solid |
CTUBE | Circular tube |
CHAN | Channel |
I | I-shaped section |
Z | Z-shaped section |
L | L-shaped section |
T | T-shaped section |
HATS | Hat-shaped section |
HREC | Hollow rectangle or box |
ASEC | Arbitrary section -- integrated cross-section inertia properties supplied by user |
MESH | User-defined mesh -- see the SECREAD command for more information about this data |
The following figure shows the shape of each cross section subtype:
When Type
= GENB, the possible nonlinear general beam sections that can be defined for Subtype
are:
ELASTIC | The generalized-stress/generalized-strain relationship is elastic (linear or nonlinear). |
PLASTIC | The generalized-stress/generalized-strain relationship is elasto-plastic (and allows for permanent deformation). |
When Type
= COMB, the only possible composite-beam section that can
be defined for Subtype
is:
MATRIX | Matrix. |
When Type
= JOINT, the possible joint sections that can be defined for Subtype
are:
UNIV | Universal joint |
REVO | Revolute joint |
SLOT | 3-D Slot joint |
PINP | Point-in-plane joint |
PRIS | Translational joint |
CYLI | Cylindrical joint |
PLAN | Planar joint |
WELD | Weld joint |
ORIE | Orient joint |
SPHE | Spherical joint |
GENE | General joint |
SCRE | Screw joint |
When Type
= REINF, the possible reinforcing sections that can be defined for Subtype
are:
DISC | Discrete reinforcing. The reinforcing fibers are arbitrarily oriented and modeled individually. |
SMEAR | Smeared reinforcing. The reinforcing fibers are homogeneous and defined as a membrane. |
When Type
= CONTACT, the possible contact sections that can be defined for Subtype
are:
CIRCLE | Geometry correction for a portion of a circle (or nearly a circle). |
SPHERE | Geometry correction for a portion of a spherical (or nearly spherical) surface. |
CYLINDER | Geometry correction for a portion of a revolute (or nearly revolute) surface. |
NORMAL | Geometry correction to specify a user-defined contact surface normal. |
BOLT | Geometry correction for a bolt thread surface. |
RADIUS | Equivalent beam/edge radius for 3-D beam-to-beam or 3-D edge-to-edge contact in a general contact definition; or radii associated with rigid target segments in a general contact definition. |
Name
An eight-character name for the section. Name
can be a string such as "W36X210" or "HP13X73"
for beam sections. Section name can consist of letters and numbers,
but cannot contain punctuation, special characters, or spaces.
REFINEKEY
Sets mesh refinement level for thin-walled beam sections.
Valid values are 0 (the default - no mesh refinement) through 5 (high
level of mesh refinement). This value has meaning only when Type
= BEAM.
SECTYPE sets the section ID number, section type, and subtype for a section. A previously-defined section with the same identification number will be redefined. The geometry data describing this section type is defined by a subsequent SECDATA command. Define the offsets (if applicable) by a subsequent SECOFFSET command. The SLIST command lists the section properties, and the SECPLOT command displays the section to scale. The SECNUM command assigns the section ID number to any subsequently-defined elements.
When defining a section for contact elements
(Type
= CONTACT) that are used in a general contact definition, a
section number representing a general contact surface can be specified. Alternatively,
you may define a subset of a region by inputting a valid label for
SECID
(ALL_EDGE, ALL_FACE, ALL_VERT, ALL_TOP,or ALL_BOT),
or by inputting a node component name with or without a component name extension (_EDGE,
_FACE, _VERT, _TOP, or _BOT). For more information, see Applying Surface Geometry Correction in the Contact Technology Guide.
For a beam section (Type
= BEAM),
a subsequent SECDATA command builds a numeric model
using a nine-node cell for determining the properties (Ixx
, Iyy
, etc.) of the section
and for the solution to the Poisson's equation for torsional behavior.
See Beam Analysis
and Cross Sections in the Structural Analysis Guide for examples using the
section commands.
For a nonlinear
general beam section (Type
= GENB),
the Subtype
and REFINEKEY
options do not apply. Subsequent commands are necessary to define
the section: BSAX, BSM1, BSM2, BSTQ, BSS1, BSS2, BSMD, and BSTE are available. All other section commands are ignored for this section
type.
For a preintegrated composite-beam section (Type
= COMB), the REFINEKEY
options do not
apply. Subsequent commands are necessary to define the section: CBTMP, CBMX, CBMD, and CBTE are available. All other section commands
are ignored for this section type.
For a tapered
beam or pipe section (Type
= TAPER),
two subsequent SECDATA commands are required (one
for each end section). Section ends must be topologically identical
(same Subtype
, number of cells and material
IDs). For a tapered pipe section, end sections must have the same
number of cells around the circumference and along the pipe wall,
and the same shell section ID for a composite pipe wall.
For a preintegrated
general shell section (Type
= GENS),
the Subtype
and REFINEKEY
options do not apply. Subsequent commands are necessary to define
the section: SSPA, SSPB, SSPD, SSPE, SSMT, SSBT, and SSPM are available. All other
section commands are ignored for this section type.
The PRETENSION section options of the SECTYPE and SECDATA commands are documented primarily to aid your understanding of the data written by the CDWRITE command. ANSYS, Inc. recommends that you generate pretension sections via the PSMESH command.
For a reinforcing section (Type
= REINF), each
subsequent SECDATA command defines the material, geometry, and
orientation of one discrete reinforcing fiber (Subtype
=
DISC) or one smeared reinforcing surface (Subtype
=
SMEAR). When referenced by a MESH200 element, only one
SECDATA command is valid.
To display elements with shapes determined from the section definition, issue the /ESHAPE command.