Prestressed eigenvalue analysis is governed by:
Where,
-
- Prestress stiffness matrix
-
- Mass matrix
-
- Eigenvector
-
- Eigenvalues
Prestressed loadcases can be either linear or non-linear. All non-linearity types are
supported.
Depending on preloading conditions, the resulting effect could be a weakened or
stiffened structure.
- If the preloading is compressive, it typically has a weakening effect on the
structure (for example, column or pillar under compressive preloading).
- If the preloading is tensile, it typically has a stiffening effect (for
example, rotorcraft blade under centrifugal preloading).
