Relationship between boundary conditions and tractions
- Tractions are usually referenced to an external surface
(boundary condition)
- However, it is also useful for stress transformations
- A traction vector is the intensity of stress at a given
point over the area of given orientation.
- Displacements or tractions can be specified as external boundary
conditions
- As a practical note, tractions and displacements are
conjugates. Typically only one or the other will be specified on
each surface in a boundary value problem. (The other is
calculated.)