# Blog

## 05 JunTransient 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://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,...

## 29 MayStress Strain Curves in FEA

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...

## 22 MayPlasticity Material Models

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...

## 01 MayResult Combination Methods

Results Combination methods are used in dynamic analyses, such as Response Spectrum Analysis (RSA) (https://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...

## 24 AprResponse Spectrum Analysis

Response Spectrum Analysis (RSA) is used to calculate a system's structural response to short, transient dynamic events, for example earthquakes. RSA is also used for DDAM shock analyses (https://fea-solutions.co.uk/ddam/). RSA is a type of restart analysis as it uses modal superposition to calculate the system's response,...

## 17 AprHarmonic Response Analysis

Harmonic Response Analysis is a linear dynamic analysis used to determine the response of a system to excitation at specific frequencies. It is also referred to as Frequency Response Analysis. The prerequisite for a Harmonic Response Analysis is a Modal Analysis, as the input frequencies needed...

## 10 AprHappy Easter

We are wishing you an egg-cellent Easter time! Your simulation team at FEA-Solutions (UK) Ltd., phone number 01202 – 798991....

## 03 AprSprings vs Dampers

Springs and Dampers are used in mechanical systems for different reasons. While springs are used to return an assembly to its initial position once it has been displaced, dampers are used to reduce the amplitude of oscillations. Springs are introduced to reduce the displacement due to...

## 27 MarDisplacement, Velocity and Acceleration

In Kinematics, which is the study of motion, there are three key characteristics of any system which describe how this system moves. These are Displacement, Velocity and Acceleration, and they are all vector quantities related to one another. The displacement of an object is how far...

## 20 MarModal Mass

When performing a Modal Analysis (https://fea-solutions.co.uk/modal-analysis/), one of the results is the modal mass associated to each natural frequency. It is a measure to judge the significance of a vibration mode, or, in simple terms, how damaging might the deformation of a particular natural frequency...