Documentation
In the Surface Load boundary condition, a distributed load per unit area is applied on a face (or set of faces). It is useful to model the loads applied through the surface in contact with fluids or other solids, where the direction of application of the load is known beforehand, in terms of the global coordinate system components.
The parameters of the boundary condition are:
The following analysis types support the usage of this boundary condition:
The traction vector is defined by the components of the load:
$$ \vec{t} = (t_x, t_y, t_z) $$
Each component has units of force (\(N\), \(lb.\), etc) per unit of surface area (\(m^2\), \(sq. in.\), etc). Thus the traction has the units of pressure (\(Pa\), \(psi\), etc). The total applied force vector over the assignment set depends on the surface area of the assigned faces:
$$ \vec{F} = \int \vec{t} dA $$
Variable surface load values can be specified with the use of the formula or table inputs. The allowed functions are:
Maximum Number of Table Parameters
Due to numerical difficulties, the underlying structural solver (Code_Aster) only supports table function definitions of one or two variables. If you need to define a function of the three spatial coordinates (X, Y, Z), or even combine it with time, you must create an analytical formula for it.
Last updated: September 26th, 2022
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