The purpose of a Dynamic Design Analysis Method (DDAM) in FEA is to find a system's response to a shock load without the need for a shock curve (acceleration vs. time graph), using empirical correlations instead. The DDAM is used for the analysis of equipment...
Seismic analysis in FEA is predominantly used in civil engineering to evaluate a building's response to an earthquake and the oscillations from it. The main parameters of the analysis are load carrying capacity, ductility, stiffness, damping and mass. There are 2 common methods of seismic analysis: ...
Shock analyses are used to evaluate the system response to a load which varies over a very small time, such as an explosion. There are several methods to carry out a Shock Analysis in FEA: Static Analysis (https://fea-solutions.co.uk/static-vs-dynamic-analysis/) Dynamic Design Analysis Method (DDAM) (https://www.fea-solutions.co.uk/ddam/) Linear Transient...
A Random Vibration Analysis (RVA) is used to calculate the system's structural response to a spectrum of random excitations, and non-deterministic loads. Examples of non-deterministic loads include loads generated on a wheel travelling over a rough road, or random structural vibrations on the airframe of...
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://fea-solutions.co.uk/non-linear-behaviour/). If the relative effects of inertia, damping...
A linear transient dynamic analysis is performed if the variation of the load is very fast or, in other words, the period (https://fea-solutions.co.uk/frequency-and-period/) of the load variation is shorter than the first natural frequency (https://fea-solutions.co.uk/modal-analysis/) of the structure (https://fea-solutions.co.uk/static-vs-dynamic-analysis/), but if non-linear effects (https://fea-solutions.co.uk/non-linear-behaviour/) don't...
A quasi-static transient analysis is performed if the load changes with time, but if this change is slow compared to the period (https://fea-solutions.co.uk/frequency-and-period/) of the first natural frequency (https://fea-solutions.co.uk/modal-analysis/) of the structure (https://fea-solutions.co.uk/static-vs-dynamic-analysis/). An example where a quasi-static transient analysis is appropriate would be stresses due...
An analysis is transient if the load is variable with time. A transient analysis is however not necessarily dynamic, as it could be quasi-static (https://fea-solutions.co.uk/quasi-static-transient-analysis/) as well. The difference between static and dynamic analysis is explained here (https://fea-solutions.co.uk/static-vs-dynamic-analysis/). If a transient analysis is dynamic as well,...
The deformation of a material is best described by its stress-strain curve (https://fea-solutions.co.uk/stress-strain-curves/). This curve covers elastic and plastic behaviour (https://fea-solutions.co.uk/elasticity-and-plasticity/). In an FEA model, the stress-strain curve is represented in a simplified way, depending on what kind of material behaviour has to be simulated. In most...
For the majority of all stress analyses, a linear-elastic material model (https://fea-solutions.co.uk/elasticity-and-plasticity/) is used because plasticity is not permitted for most applications. However, if plasticity does need to be included, several different types of material models can be used. The two main groups of plasticity models...