SECDATA

SECDATA, VAL1, VAL2, VAL3, VAL4, VAL5, VAL6, VAL7, VAL8, VAL9, VAL10, VAL11, VAL12
Describes the geometry of a section.

PREP7: Cross Sections
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VAL1, VAL2, VAL3, . . . , VAL12

Values, such as thickness or the length of a side or the numbers of cells along the width, that describe the geometry of a section. The terms VAL1, VAL2, etc. are specialized for each type of cross-section.

Notes

The SECDATA command defines the data describing the geometry of a section. The command is divided into these section types: Beams, Links, Pipes, Axisymmetric, Taper, Shells, Pretension, Joints, Reinforcing, and Contact.

The data input on the SECDATA command is interpreted based on the most recently issued SECTYPE command. The data required is determined by the section type and subtype, and is different for each one.

Beams

Type: BEAM

Beam sections are referenced by BEAM188 and BEAM189 elements. Not all SECOFFSET location values are valid for each subtype.

Type: BEAM, Subtype: RECT

Data to provide in the value fields:
B, H, Nb, Nh
where
B = Width
H = Height
Nb = Number of cells along width; default = 2
Nh = Number of cells along height; default = 2
Nb*Nh

Type: BEAM, Subtype: QUAD

Data to provide in the value fields:
yI, zI, yJ, zJ, yK, zK, yL, zL, Ng, Nh
yI, zI, yJ, zJ, yK, zK, yL, zL = Coordinate location of various points
Ng = Number of cells along g; default = 2
Nh = Number of cells along h; default = 2
Ng*Nh

Degeneration to triangle is permitted by specifying the same coordinates for cells along an edge.

  

Type: BEAM, Subtype: CSOLID

Data to provide in the value fields:
R, N, T
where
R = Radius
N = Number of divisions around the circumference; 8 N 120 (where a greater value improves accuracy slightly); default = 8
T = Number of divisions through the radius; default = 2

Type: BEAM, Subtype: CTUBE

Data to provide in the value fields:
Ri, Ro, N
where
Ri = Inner radius of the tube
Ro = Outer radius of the tube
N = Number of cells around the circumference; N 8 (where a greater value improves accuracy slightly); default = 8

This subtype is similar to type PIPE. However, elements using PIPE account for internal or external pressures, whereas elements using CTUBE do not.

  

Type: BEAM, Subtype: CHAN

Data to provide in the value fields:
W1, W2, W3, t1, t2, t3
where
W1, W2 = Lengths of the flanges
W3 = Overall depth
t1, t2 = Flange thicknesses
t3 = Web thicknesses

Type: BEAM, Subtype: I

Data to provide in the value fields:
W1, W2, W3, t1, t2, t3
where
W1, W2 = Width of the top and bottom flanges
W3 = Overall depth
t1, t2 = Flange thicknesses
t3 = Web thicknesses
  

Type: BEAM, Subtype: Z

Data to provide in the value fields:
W1, W2, W3, t1, t2, t3
where
W1, W2 = Flange lengths
W3 = Overall depth
t1, t2 = Flange thicknesses
t3 = Stem thicknesses

Type: BEAM, Subtype: L

Data to provide in the value fields:
W1, W2, t1, t2
where
W1, W2 = Leg lengths
t1, t2 = Leg thicknesses

If W2 is a negative value, the section will be flipped.

  

Type: BEAM, Subtype: T

Data to provide in the value fields:
W1, W2, t1, t2
where
W1 = Flange width
W2 = Overall depth
t1 = Flange thicknesses
t2 = Stem thicknesses

If W2 is a negative value, the section will be flipped.

Type: BEAM, Subtype: HATS

Data to provide in the value fields:
W1, W2, W3, W4, t1, t2, t3, t4, t5
where
W1, W2 = Width of the brim
W3 = Width of the top of the hat
W4 = Overall depth
t1, t2 = Thickness of the brim
t3 = Thickness of the top of the hat
t4, t5 = Web thicknesses
  

Type: BEAM, Subtype: HREC

Data to provide in the value fields:
W1, W2, t1, t2, t3, t4
where
W1 = Outer width of the box
W2 = Outer height of the box
t1, t2, t3, t4 = Wall thickness

Type: BEAM, Subtype: ASEC

Arbitrary: User-supplied integrated section properties instead of basic geometry data.
Data to provide in the value fields:
A, Iyy, Iyz, Izz, Iw, J, CGy, CGz, SHy, SHz, TKz, TKy
where
A = Area of section
Iyy = Moment of inertia about the y axis
Iyz = Product of inertia
Izz = Moment of inertia about the z axis
Iw = Warping constant
J = Torsional constant
CGy = y coordinate of centroid
CGz = z coordinate of centroid
SHy = y coordinate of shear center
SHz = z coordinate of shear center
TKz = Thickness along Z axis (maximum height)
TKy = Thickness along Y axis (maximum width)

SECPLOT cannot display an ASEC plot.

Type: BEAM, Subtype: MESH

User-defined mesh.
Data required is created by the SECWRITE command and is read in by the SECREAD command.
When a user mesh is input via SECREAD, the program calculates the area, second moments of inertia, centroid, torsion constant, warping rigidity, and shear center.
If you redefine a material for a composite cross-section after creating the section, reissue the SECREAD command.
 

Links

Type: LINK

Link sections are referenced by the LINK180 element.

Data to provide in the value fields:
VAL1 = Area

Pipes

Type: PIPE

Pipe sections are referenced by the PIPE288, PIPE289, and ELBOW290 elements.

Data to provide in the value fields:
D o , T w , N c , S s , N t , M int , M ins , T ins
where
D o = Outside diameter of pipe. Use a constant value for a circular pipe and an array for a noncircular pipe. (Noncircular pipe sections are referenced by the ELBOW290 element only. See Defining a Noncircular Pipe in the Structural Analysis Guide.)
T w = Wall thickness (defaults to Do / 2, or “solid” pipe).
N c = Number of cells around the circumference (8 N c 120, where a greater value improves accuracy slightly; default = 8).
S s = Section number of the shell representing the pipe wall. Valid with ELBOW290 only. (Total thickness of the section is scaled to T w . The program considers the innermost layer inside of the pipe to be the first layer.)
N t = Number of cells through the pipe wall. Valid values are 1 (default), 3, 5, 7, and 9. Cells are graded such that they are thinner on the inner and outer surfaces. Valid with PIPE288 and PIPE289 only.
M int = Material number of fluid inside of the pipe. The default value is 0 (no fluid). This value is used to input the density of the internal fluid. The fluid inside the pipe element is ignored unless the free surface in a global X-Y plane is added as face 3 (SFE) and is high enough to include at least one end node of the element.
M ins = Material number of material external to the pipe (such as insulation or armoring). The default value is 0 (no external material). This value is used to input the density of the external material. (External material adds mass and increases hydraulic diameter, but does not add to stiffness.)
T ins = Thickness of material external to the pipe, such as insulation. The default value is 0 (no external material).

The accuracy of the ovalization value (OVAL) output by ELBOW290 (Structural Elbow form only) improves as the specified number of cells around the circumference (N c ) is increased.

External material (M ins ) adds mass and increases hydraulic diameter, but does not add to stiffness.

Taper

Type: TAPER

Tapered sections are referenced by BEAM188, BEAM189 and ELBOW290 elements. After specifying the tapered section type (SECTYPE,,TAPER), issue separate SECDATA commands to define each end of the tapered beam or pipe.

Data to provide in the value fields:
Sec_IDn, XLOC, YLOC, ZLOC
where:
Sec_IDn = Previously defined beam or pipe section at ends 1 and 2.
XLOC, YLOC, ZLOC = The location of Sec_IDn in the global Cartesian coordinate system.

For more information about tapered beams and pipes, including assumptions and example command input, see Defining a Tapered Beam or Pipe in the Structural Analysis Guide.

General Axisymmetric

Type: AXIS

General axisymmetric sections are referenced by the SURF159, SOLID272, and SOLID273 elements. Use this command to locate the axisymmetric axis.

Data to provide in the value fields:
Pattern 1 (two points):
1, X1, Y1, Z1, X2, Y2, Z2
where X1, Y1, Z1, X2, Y2, Z2 are global Cartesian coordinates.
Pattern 2 (coordinate system number plus axis [1 = x, 2 = y, 3 = z] ):
2, csys, axis
where csys is a Cartesian coordinate system.
Pattern 3 (origin plus direction):
3, XO, YO, ZO, xdir, ydir, zdir
where XO, YO, ZO are global Cartesian coordinates and xdir, ydir, and zdir are direction cosines.

Shells

Type: SHELL

Shell sections are referenced by the SHELL131, SHELL132, SHELL181, SOLID185 Layered Solid, SOLID186 Layered Solid, SOLSH190, SHELL208, SHELL209, SOLID278 Layered Solid, SOLID279 Layered Solid, and SHELL281 elements.

Data to provide in the value fields:
TK, MAT, THETA, NUMPT, LayerName
where
TK = Thickness of shell layer. Zero thickness (not valid for SHELL131 and SHELL132) indicates a dropped layer. The sum of all layer thicknesses must be greater than zero. The total thickness can be tapered via the SECFUNCTION command.
MAT = Material ID for layer (any current-technology material model is available for SHELL181, SOLID185 Layered Solid, SOLID186 Layered Solid, SOLSH190, SHELL208, SHELL209, SOLID278 Layered Solid and SOLID279 Layered Solid [including UserMat ], and SHELL281). MAT is required for a composite (multi-layered) laminate. For a homogeneous (single-layered) shell, the default is the MAT command setting. Use the TREF and/or the MP, REFT commands to address multiple reference temperatures.
THETA = Angle (in degrees) of layer element coordinate system with respect to element coordinate system (ESYS).
NUMPT = Number of integration points in layer. The GUI permits 1, 3, 5, 7, or 9 points (default = 3). However a higher odd number may be specified in the command. The integration rule used is Simpson's Rule. (NUMPT is not used by SHELL131 and SHELL132.)

Pretension

Type: PRETENSION

Pretension sections are referenced by the PRETS179 element.

Data to provide in the value fields:
node, nx, ny, nz
where
node = Pretension node number.
nx = Orientation in global Cartesian x direction.
ny = Orientation in global Cartesian y direction.
nz = Orientation in global Cartesian z direction.

The following usage is typical:

SECTYPE, 1, PRETENSION
SECDATA, 13184, 0.000, 0.000, 1.000
SECMODIF, 1, NAME, example
SLOAD, 1, PL01, TINY, FORC, 100.00 , 1, 2

The PRETENSION section options of SECTYPE and SECDATA are documented mainly to aid in the understanding of data written by CDWRITE. ANSYS, Inc. recommends that you generate pretension sections using PSMESH.

Joints

Type: JOINT

Joint sections are referenced by MPC184 joint elements.

Data to provide in the value fields:
length1, length2, length3, angle1, angle2, angle3
where
length1-3 = Reference lengths used in the constitutive calculations.
angle1-3 = Reference angles used in the constitutive calculations.

The following table shows the lengths and angles to be specified for different kinds of joints.

Joint Subtype Reference lengths and angles
Revolute REVO

angle1 for x-axis revolute joint
angle3 for z-axis revolute joint

Universal UNIVangle1 and angle3
Slot SLOTlength1
Point-in-plane PINPlength2 and length3,
Revolute Translational PRISlength1
Cylindrical CYLI

length1 and angle1 for x-axis cylindrical joint
length3 and angle3 for z-axis cylindrical joint

Planar PLAN

length2, length3, and angle1 for x-axis planar joint
length1, length2, and angle3 for z-axis planar joint

Weld WELD(not used)
Orient ORIE(not used)
Spherical SPHE(not used)
General GENElength1, length2, length3, angle1, angle2, angle3 -- Depends upon which “unconstrained” relative degrees of freedom are available.
Screw SCRElength3 and angle3

The reference length and angle specifications correspond to the free relative degrees of freedom in a joint element for which constitutive calculations are performed. These values are used when stiffness and/or damping are specified for the joint elements.

If the reference lengths and angles are not specified, they are calculated from the default or starting configuration for the element.

See MPC184 or the individual joint element descriptions for more information on joint element constitutive calculations.

Reinforcing

Type: REINF

Each SECDATA command defines the material, geometry, and orientation (if Subtype = SMEAR) of one reinforcing member (discrete fiber or smeared surface) in the section. The reinforcing section can be referenced by reinforcing elements (REINF263, REINF264, and REINF265), or MESH200 elements when used for temporarily representing reinforcing members. Only one SECDATA command is allowed per section when referenced by MESH200 elements. For more information, see Reinforcing in the Mechanical APDL Structural Analysis Guide.

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Type: REINF, Subtype: DISCRETE

Defines discrete reinforcing fibers with arbitrary orientations. For the MESH input pattern, reinforcing section data is referenced by MESH200 elements. For other patterns, issue separate SECDATA commands to define each reinforcing fiber.

Data to provide in the value fields:
MAT, A, PATT, V1, V2, V3, V4, V5
MAT = Material ID for the fiber. (See REINF264 for valid material models.) When the reinforcing section is referenced by a MESH200 element, the default is the MESH200 element material ID (MAT). When the section is referenced by reinforcing elements, the material ID is required for all fibers, and no default for this value is available.
A = Cross-section area of the reinforcing fiber.
PATT = Input pattern code (described below) indicating how the location of this fiber is defined. Available input patterns are MESH (when the section is referenced by a MESH200 element), and LAYN, EDGO, and BEAM (when the section is referenced by a reinforcing element).
V1, V2, V3, V4, V5 = Values to define the location of the reinforcing fiber (depending on the PATT pattern code used), as shown:

PATT : MESH

Description: The locations of reinforcing fibers are defined directly via MESH200 element connectivity.

Required input: None.

PATT : LAYN

Description: The discrete reinforcing fiber is placed in the middle of a layer in a layered base element. The orientation of the fiber within the layer is adjustable via offsets with respect to a specified element edge.

Required input:

V1 (or N) -- The number of the layer in the base element on which to apply the reinforcing fiber. The default value is 1.
V2 (or e) -- The number to indicate the element edge to which the offsets are measured. The default value is 1.
V3 and V4 (or Y1 and Y2) -- The normalized distances from the fiber to the two ends of the specified element edge. Valid values for Y1 and Y2 are 0.0 through 1.0. The default value of Y1 is 0.5. The default value of Y2 is Y1.

When applied to 8-node or 20-node layered solid elements:

When applied to 4-node or 8-node layered shell elements:

PATT : EDGO

Description: The orientation of the discrete reinforcing fiber is similar to one of the specified element edges. The fiber orientation can be further adjusted via offsets with respect to the specified element edge.

Required input:

V1 (or O) -- The number to indicate the element edge to which the offsets are measured. The default value is 1.
V2 and V3 (or Y1 and Z1) -- The normalized distances from the fiber to the first end of the specified element edge. Valid values for Y1 and Z1 are 0.0 through 1.0. The default value for Y1 and Z1 is 0.5.
V4 and V5 (or Y2 and Z2) – The normalized distances from the fiber to the second end of the specified element edge. Value values for Y2 and Z2 are 0.0 through 1.0. The default value for Y2 is Y1, and the default value for Z2 is Z1.

If the base element is a beam or link, the program ignores values V2 through V5 and instead places the reinforcing in the center of the beam or link.

When applied to 8-node or 20-node solid elements:

When applied to tetrahedral elements:

When applied to 3-D shell elements:

When applied to beam or link elements:

PATT : BEAM

Description: Use this specialized input pattern for defining reinforcing in regular constant and tapered beams.

Required input:

V1 and V2 (or Y1 and Z1) -- Y and Z offsets with respect to the section origin in the first beam section referenced by the base beam element. The default value for Y1 and Z1 is 0.0.
V3 and V4 (or Y2 and Z2) -- Y and Z offsets with respect to the section origin in the second beam section referenced by the base beam element. The default value for Y2 is Y1, and the default value for Z2 is Z1. (Because V3 and V4 values apply only to tapered beams, the program ignores them if the base beam has a constant section.)

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Type: REINF, Subtype: SMEAR

Suitable for layers of reinforcing fibers with uniform cross-section area and spacing. Each SECDATA command defines the one reinforcing layer in the section. When referenced by a MESH200 element, only one SECDATA command per section is allowed. When referenced by reinforcing elements (REINF263 and REINF265), this limitation does not apply.

Data to provide in the value fields:
MAT, A, S, KCN, THETA, PATT, V1, V2, V3, V4, V5
where
MAT = Material ID for layer. (See REINF263 or REINF265 for available material models.) When the section is referenced by a MESH200 element, the default is the MESH200 element material ID (MAT). When the section is referenced by reinforcing elements, the material ID is required for all fibers, and no default for this value is available.
A = Cross-section area of a single reinforcing fiber.
S = Distance between two adjacent reinforcing fibers.
KCN = Local coordinate system reference number for this layer. (See LOCAL for more information.) When the section is referenced by a MESH200 element, the default KCN value is the MESH200 element coordinate system ID (ESYS). For the 2-D smeared reinforcing element REINF263, KCN input is not required. When KCN is not specified, the program uses a default layer coordinate system (described in REINF263 and REINF265).
THETA = Angle (in degrees) of the final layer coordinate system with respect to the default layer system or the layer system specified in the KCN field. This value is ignored for REINF263 when that element is embedded in 2-D plane strain or plane stress base elements.
PATT = Input pattern code (described below) indicating how the location of this fiber is defined. Available input patterns are MESH (when the section is referenced by a MESH200 element), and LAYN, EDGO, and BEAM (when the section is referenced by a reinforcing element).
V1, V2, V3, V4, V5 = Values to define the location of the reinforcing layer, as shown:

PATT : MESH

Description: The locations of reinforcing fibers are defined directly via MESH200 element connectivity.

Required input: None.

PATT : LAYN

Description: The smeared reinforcing layer is placed in the middle of a layer in a layered base element.

Required input: V1 (or n) -- The number of the layer in the base element on which to apply the reinforcing layer. The default value is 1.

When applied to layered solid elements:

When applied to 2-D axisymmetric shells:

When applied to 3-D layered shells:

PATT : EDGO

Description: This pattern applies only to 2-D smeared reinforcing element REINF263. The smeared reinforcing layer is represented by a line in 2-D. The orientation of the 2-D smeared reinforcing layer is similar to one of the specified element edges. The fiber orientation can be further adjusted via offsets with respect to the specified element edge.

Required input:

V1 (or O) -- The number to indicate the element edge to which the offsets are measured. The default value is 1.
V2 (or Y1) -- The normalized distances from the reinforcing layer to the first end of the specified element edge. Valid values for Y1 are 0.0 through 1.0. The default value for Y1 is 0.5. V3 (or Z1) input is ignored.
V4 (or Y2) -- The normalized distances from the reinforcing layer to the second end of the specified element edge. Valid value values for Y2 are 0.0 through 1.0. The default value for Y2 is Y1. V4 (or Y2) is ignored for axisymmetric shell elements. V5 (or Z2`) input is ignored.

When applied to 2-D 4-node or 8-node solid elements:

When applied to 2-D 3-node or 6-node triangular solid elements:

When applied to 2-node or 3-node axisymmetric shell elements:

PATT : ELEF

Description: The smeared reinforcing layer is oriented parallel to one of three adjacent element faces. (This pattern does not apply to 2-D smeared reinforcing element REINF263.)

Required input:

V1 (or F) -- The number to indicate the base element face. The default value is 1.
V2 (or d1) -- The normalized distance from the layer to the specified base element face. Valid values for d1 are 0.0 through 1.0. The default value is 0.5.
V3 (or d2) -- The normalized distance from corners JJ and KK of the layer to the specified base element face (applicable to 8-node or 20-node solid elements only). Valid values for d2 are 0.0 through 1.0. The default value is d1.

When applied to 8-node or 20-node solid elements:

where

d1 = distance II and LL
d2 = distance JJ and KK

When applied to tetrahedral elements:
 

When applied to 3-D shell elements:

CONTACT

Type: CONTACT

Geometry Correction Contact sections for geometry correction (Subtype = CIRCLE, SPHERE, or CYLINDER) are referenced by the following elements: TARGE169, TARGE170, CONTA171, CONTA172, CONTA173, and CONTA174. This geometry correction applies to cases where the original meshes of contact elements or target elements are located on a portion of a circular, spherical, or revolute surface.

Type: CONTACT, Subtype: CIRCLE

Data to provide in the value fields for Subtype = CIRCLE:
X0, Y0 (circle center location in Global Cartesian coordinates - XY plane)

Type: CONTACT, Subtype: SPHERE

Data to provide in the value fields for Subtype = SPHERE:
X0, Y0, Z0 (sphere center location in Global Cartesian coordinates)

Type: CONTACT, Subtype: CYLINDER

Data to provide in the value fields for Subtype = CYLINDER:
X1, Y1, Z1, X2, Y2, Z2 (two ends of cylindrical axis in Global Cartesian coordinates)

User-Defined Contact Surface Normal The contact section for a user-defined contact surface normal (Subtype = NORMAL) is referenced by the following elements: CONTA171, CONTA172, CONTA173, CONTA174, and CONTA175. This geometry correction is used to define a shift direction for interference fit solutions.

Type: CONTACT, Subtype: NORMAL

Data to provide in the value fields for Subtype = NORMAL:
CSYS, NX, NY, NZ
where
CSYS = Local coordinate system number (defaults to global Cartesian).
NX, NY, NZ = Direction cosines with respect to CSYS.

Radius values associated with contact or target elements The radius contact section (Subtype = RADIUS) is referenced by contact or target elements in a general contact definition under the following circumstances:

  • Equivalent 3-D contact radius for beam-to-beam contact - The contact section for a user-defined equivalent contact radius (Subtype = RADIUS) is referenced by the element type CONTA177 within a general contact definition. 3-D beam-to-beam contact (or edge-to-edge contact) modeled by this line contact element assumes that its surface is a cylindrical surface.

  • Radius (or radii) of rigid target segments - The contact section for rigid target segment radii is referenced by target elements TARGE169 (circle segment type) and TARGE170 (line, parabola, cylinder, sphere, or cone segment type) in a general contact definition.

Type: CONTACT, Subtype: RADIUS

Data to provide in the value fields for Subtype = RADIUS if the section is used as an equivalent contact radius for 3-D beam-to-beam contact:
VAL1 = Equivalent radius - outer radius
VAL2 = Equivalent radius - inner radius (internal beam-to-beam contact)
VAL3: Set to 1 for internal beam-to-beam contact. Defaults to external beam-to-beam contact.
Data to provide in the value fields for Subtype = RADIUS if the section is used for 2-D or 3-D rigid target segments:
VAL1 = First radius of the target segment (used for circle, line, parabola, cylinder, sphere, and cone segment types)
VAL2 = Second radius of the target segment (used only for the cone segment type)

Simplified Bolt Thread Modeling The contact section for bolt-thread modeling (Subtype = BOLT) is referenced by the following elements: CONTA171, CONTA172, CONTA173, CONTA174, and CONTA175. It applies to cases where the original meshes of contact elements are located on a portion of a bolt-thread surface. This feature allows you to include the behavior of bolt threads without having to add the geometric detail of the threads. Calculations are performed internally to approximate the behavior of the bolt-thread connections.

Type: CONTACT, Subtype: BOLT

Data to provide in the value fields for Subtype = BOLT:
Dm , P, ALPHA, N, X1, Y1, Z1, X2, Y2, Z2
where
Dm = Mean pitch diameter, dm.
P = Pitch distance, p.
ALPHA = Half-thread angle, α (defaults to 30 degrees).
N = Number of starts (defaults to 1).
X1, Y1, Z1, X2, Y2, Z2 = Two end points of the bolt axis in global Cartesian coordinates.

Menu Paths

Main Menu>Preprocessor>Sections>Axis>Add
Main Menu>Preprocessor>Sections>Axis>Edit
Main Menu>Preprocessor>Sections>Beam>Common Sections
Main Menu>Preprocessor>Sections>Beam>Taper Sections>By Picked Nodes
Main Menu>Preprocessor>Sections>Beam>Taper Sections>By XYZ Location
Main Menu>Preprocessor>Sections>Contact>Add
Main Menu>Preprocessor>Sections>Contact>Edit
Main Menu>Preprocessor>Sections>Joints>Add / Edit
Main Menu>Preprocessor>Sections>Link>Add
Main Menu>Preprocessor>Sections>Link>Edit
Main Menu>Preprocessor>Sections>Pipe>Add
Main Menu>Preprocessor>Sections>Pipe>Edit
Main Menu>Preprocessor>Sections>Reinforcing>Add / Edit
Main Menu>Preprocessor>Sections>Shell>Lay-up>Add / Edit

Release 18.2 - © ANSYS, Inc. All rights reserved.