26 Jun 2020 Non-Linear Transient Dynamic Analysis
A non-linear transient dynamic analysis allows the simulation of time dependant problems whilst considering any or all of the three types of non-linearities: material non-linearity, geometric non-linearity and constraint non-linearity. For more information on non-linear behaviour, please visit: (https://www.fea-solutions.co.uk/non-linear-behaviour/).
If the relative effects of inertia, damping and transient loads are significant in the system, a non-linear transient analysis should be used. Models that experience buckling or other unstable loading conditions will often converge better in a non-linear transient analysis, due to the inertia effects keeping it stable.
Often in a non-linear transient dynamic analysis, damping is used in the analysis. This can either be defined as a global damping coefficient, which applies the same value to all parts of the model, or individual damping values applied to any parts that share the same material, called material-based damping. The latter is used more often as it offers increased flexibility to the user.
An example where a non-linear transient dynamic analysis is appropriate would be a drop test simulation. Plastic behaviour of the material (https://www.fea-solutions.co.uk/non-linear-material/) will have to be included, as well as non-linear contact (https://www.fea-solutions.co.uk/non-linear-contact/) and large deformation (https://www.fea-solutions.co.uk/large-deformation/).
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