When it comes to graduating from a Linear analysis to a Non-Linear analysis, the 3 deciding factors that decide that an analysis is a Non-Linear analysis is:
1. Material Non-Linearities
A. Materials with nonlinear material properties, such as alloys, elastomers, rubbers, plastics etc.
B. Parts designed to yield and flow in the plasticity region (where the user must use a model capable of simulating elastoplasticity.
2. Geometric Non-Linearities
A. Contact area may change with loading conditions
B. Large or permanent deformations
C. Stiffness of the structure decreases due to local buckling
3. Boundary Non-Linearities
This class of non-linear behaviour is a result of the changing nature of the boundary conditions (kinematic/force) of the structures involved in the analysis during motion:
A. Contact Problems
B. Pounding of Structures
C. Fitting Problems
D. Gear-tooth contacts
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