StructuralBC Properties
Boundary condition or boundary load for structural analysis model
Domain-specific structural workflow is not recommended. New features might not be compatible with this workflow. For help migrating your existing code to the unified finite element workflow, see Migration from Domain-Specific to Unified Workflow.
A StructuralBC
object specifies the type of
PDE boundary condition or boundary load on a set of geometry boundaries. A StructuralModel
object contains a vector of StructuralBC
objects in
its BoundaryConditions.StructuralBCAssignments
property.
To specify boundary conditions for your model, use the structuralBC
function. To specify boundary loads, use structuralBoundaryLoad
.
Properties of StructuralBC
RegionType
— Geometric region type
'Face'
for 3-D geometry | 'Edge'
for 2-D geometry
Geometric region type, specified as 'Face'
for a 3-D
geometry or 'Edge'
for a 2-D geometry.
Data Types: char
| string
RegionID
— Geometric region ID
vector of positive integers
Geometric region ID, specified as a vector of positive integers. Find the
region IDs by using pdegplot
with
'FaceLabels'
(3-D) or 'EdgeLabels'
(2-D) set to 'on'
.
Data Types: double
Vectorized
— Vectorized function evaluation
'off'
(default) | 'on'
Vectorized function evaluation, specified as 'off'
or
'on'
. This evaluation applies when you pass a
function handle as an argument. To save time in the function handle
evaluation, specify 'on'
, assuming that your function
handle computes in a vectorized fashion. See Vectorization. For details on
this evaluation, see Nonconstant Boundary Conditions.
Data Types: char
| string
Boundary Constraints and Enforced Displacements
Displacement
— Enforced displacement
numeric vector | function handle
Enforced displacement, specified as a numeric vector or function handle. The numeric vector must contain two elements for a 2-D model and three elements for a 3-D model. The function must return a two-row matrix for a 2-D model and a three-row matrix for a 3-D model. Each column of the matrix must correspond to the enforced displacement vector at the boundary coordinates provided by the solver.
Data Types: double
| function_handle
XDisplacement
— x-component of enforced displacement
number | function handle
x-component of the enforced displacement, specified as a number or function handle. The function must return a row vector. Each column of the vector must correspond to the value of the x-component of the enforced displacement at the boundary coordinates provided by the solver.
For axisymmetric models, this property contains the radial component (r-component) of the enforced displacement.
Data Types: double
| function_handle
YDisplacement
— y-component of enforced displacement
number | function handle
y-component of the enforced displacement, specified as a number or function handle. The function must return a row vector. Each column of the vector must correspond to the value of the y-component of the enforced displacement at the boundary coordinates provided by the solver.
For axisymmetric models, this property contains the axial component (z-component) of the enforced displacement.
Data Types: double
| function_handle
ZDisplacement
— z-component of enforced displacement
number | function handle
z-component of the enforced displacement, specified as a number or function handle. The function must return a row vector. Each column of the vector must correspond to the value of the z-component of the enforced displacement at the boundary coordinates provided by the solver.
Data Types: double
| function_handle
Constraint
— Standard structural boundary constraints
'free'
| 'fixed'
| 'roller'
| 'symmetric'
| 'multipoint'
Standard structural boundary constraints, specified as
'free'
,'fixed'
,'roller'
,
'symmetric'
, or
'multipoint'
.
Data Types: char
Radius
— Radius of circle (for 2-D geometry) or sphere (for 3-D geometry) around reference point location for multipoint constraint
positive number
Radius of a circle (for a 2-D geometry) or a sphere (for a 3-D geometry) around the reference point location for the multipoint constraint, specified as a positive number.
Data Types: double
Reference
— Reference point location for multipoint constraint
2-by-1 numeric vector | 3-by-1 numeric vector
Reference point location for the multipoint constraint, specified as a 2-by-1 (for a 2-D geometry) or 3-by-1 (for a 3-D geometry) numeric vector.
Data Types: double
Boundary Loads
Force
— Concentrated force
numeric vector | function handle
Concentrated force at a vertex, specified as a numeric vector or function handle.
Data Types: double
| function_handle
SurfaceTraction
— Normal and tangential distributed forces on boundary
numeric vector | function handle
Normal and tangential distributed forces on the boundary (in the global Cartesian coordinates system), specified as a numeric vector or function handle. The numeric vector must contain two elements for a 2-D model and three elements for a 3-D model. The function must return a two-row matrix for a 2-D model and a three-row matrix for a 3-D model. Each column of the matrix must correspond to the surface traction vector at the boundary coordinates provided by the solver.
Data Types: double
| function_handle
Pressure
— Pressure normal to boundary
number | function handle
Pressure normal to the boundary, specified as a number or function handle. The function must return a row vector in which each column corresponds to the value of pressure at the boundary coordinates provided by the solver. A positive value of pressure acts in the direction of the outward normal to the boundary.
Data Types: double
| function_handle
TranslationalStiffness
— Distributed spring stiffness
numeric vector | function handle
Distributed spring stiffness for each translational direction used to model an elastic foundation, specified as a numeric vector or function handle. The numeric vector must contain two elements for a 2-D model and three elements for a 3-D model. The custom function must return a two-row matrix for a 2-D model and a three-row matrix for a 3-D model. Each column of this matrix corresponds to the stiffness vector at the boundary coordinates provided by the solver.
Data Types: double
| function_handle
Time Variation of Force, Pressure, or Enforced Displacement
StartTime
— Start time for displacement component, pressure, or concentrated force load
nonnegative number
Start time for a displacement component, the pressure, or the concentrated force load, specified as a nonnegative number.
Data Types: double
EndTime
— End time for displacement component, pressure, or concentrated force load
nonnegative number
End time for a displacement component, the pressure, or the concentrated force load, specified as a nonnegative number.
Data Types: double
RiseTime
— Rise time for displacement component, pressure, or concentrated force load
nonnegative number
Rise time for a displacement component, the pressure, or the concentrated force load, specified as a nonnegative number.
Data Types: double
FallTime
— Fall time for displacement component, pressure, or concentrated force load
nonnegative number
Fall time for a displacement component, the pressure, or the concentrated force load, specified as a nonnegative number.
Data Types: double
Sinusoidal Variation of Force, Pressure, or Enforced Displacement
Frequency
— Frequency of sinusoidal displacement component, sinusoidal pressure, or concentrated force
positive number
Frequency of a sinusoidal displacement component, the sinusoidal pressure, or the concentrated force, specified as a positive number, in radians per unit of time.
Data Types: double
Phase
— Phase of sinusoidal displacement component, sinusoidal pressure, or concentrated force
nonnegative number
Phase of a sinusoidal displacement component, the sinusoidal pressure, or the concentrated force, specified as a nonnegative number, in radians per unit of time.
Data Types: double
Label
— Label for use with linearizeInput
character vector | string
Label for use with linearizeInput
, specified as a
character vector or a string.
Data Types: char
| string
Version History
Introduced in R2017b
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