Blog

17 Jul 2020Seismic Analysis

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: ...

10 Jul 2020Shock 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://www.fea-solutions.co.uk/static-vs-dynamic-analysis/) Dynamic Design Analysis Method (DDAM) Linear Transient Dynamic...

03 Jul 2020Random Vibration Analysis

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...

26 Jun 2020Non-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...

19 Jun 2020Linear Transient Dynamic Analysis

A linear transient dynamic analysis is performed if the variation of the load is very fast or, in other words, the period (https://www.fea-solutions.co.uk/frequency-and-period/) of the load variation is shorter than the first natural frequency (https://www.fea-solutions.co.uk/modal-analysis/) of the structure (https://www.fea-solutions.co.uk/static-vs-dynamic-analysis/), but if non-linear effects (https://www.fea-solutions.co.uk/non-linear-behaviour/) don't...

12 Jun 2020Quasi-Static Transient Analysis

A quasi-static transient analysis is performed if the load changes with time, but if this change is slow compared to the period (https://www.fea-solutions.co.uk/frequency-and-period/) of the first natural frequency (https://www.fea-solutions.co.uk/modal-analysis/) of the structure (https://www.fea-solutions.co.uk/static-vs-dynamic-analysis/). An example where a quasi-static transient analysis is appropriate would be stresses due...

05 Jun 2020Transient Analysis

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://www.fea-solutions.co.uk/quasi-static-transient-analysis/) as well. The difference between static and dynamic analysis is explained here (https://www.fea-solutions.co.uk/static-vs-dynamic-analysis/). If a transient analysis is dynamic as well,...

29 May 2020Stress Strain Curves in FEA

The deformation of a material is best described by its stress-strain curve (https://www.fea-solutions.co.uk/stress-strain-curves/). This curve covers elastic and plastic behaviour (https://www.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...

22 May 2020Plasticity Material Models

For the majority of all stress analyses, a linear-elastic material model (https://www.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...

01 May 2020Result Combination Methods

Results Combination methods are used in dynamic analyses, such as Response Spectrum Analysis (RSA) (https://www.fea-solutions.co.uk/response-spectrum-analysis/), in order to combine results from multiple analyses of a structure to find the overall response of the system. These multiple analyses are from the excitations of the various modes...