# Blog

## 10 Jul 2019Non-Linear Material

Non-linear material behaviour is one of the three non-linear behaviours in structural analysis, see: (https://www.fea-solutions.co.uk/non-linear-behaviour/) When talking about non-linear materials, most people think about plastic behaviour. This is however just one of several non-linear materials. They are: Plasticity This describes the non-reversible deformation of a solid part, see:...

## 05 Jul 2019Non-Linear Behaviour

Numerical simulation, including FEA, is well suited to realistically predict non-linear behaviour of physical phenomena. Looking just at structural analysis, there are three different types of non-linear behaviour. They are: Non-Linear Material This has to be considered if the material doesn't behave linear-elastically. Read more about these...

## 27 Jun 2019Factor of Safety

To assess if a structure is suitable for the intended purpose, the results of a FE analysis have to be compared to acceptance criteria, also called allowables. For a stress analysis, allowables could be e.g. equivalent stresses (see https://www.fea-solutions.co.uk/equivalent-stress/) or deflections. The Factor of Safety (FoS) is...

## 21 Jun 2019Equivalent Stress

The stress results of a FE analysis are three-dimensional tensors, see: (https://www.fea-solutions.co.uk/stress-tensor/) Material properties including Yield Strength and Ultimate Strength are however usually derived from uniaxial tests, e.g. tensile tests, see: (https://www.fea-solutions.co.uk/tensile-tests/) Depending on the material used and its failure mode, there are different conversions done: For...

## 14 Jun 2019Stress Tensor

For anybody who wants to assess FEA results, it is important to understand the concept of the Stress Tensor. A tensor is a mathematical entity. Other, more commonly known mathematical entities are scalars and vectors (although these two are actually just special forms of tensors). Simply speaking,...

## 07 Jun 2019Engineering Stress vs True Stress

The data obtained from a Tensile Test (https://www.fea-solutions.co.uk/tensile-tests/) are forces and displacements. In order for this to be useful to an engineer, the applied force has to be converted into a stress. (https://www.fea-solutions.co.uk/stress-strain-curves/) There are two types of stress which can be calculated, Engineering Stress and True...

## 31 May 2019Elastic Modulus

In Hooke's Law (https://www.fea-solutions.co.uk/law-of-elasticity/), the Spring Constant k describes the relation between an applied load and the resulting deformation of a body. It depends on both the shape (geometry) of the part as well as its material. To have a constant that is just depending on the...

## 24 May 2019Law of Elasticity

The Law of Elasticity, or Hooke's Law, is a brilliantly simple form to express the elastic deformation of a body. In our times, this Law of Physics is practically known by most people, but it was revolutionary when first stated in 1660 by the British...

## 17 May 2019Deformation Behaviour

The shape of a Stress-Strain Curve allows a handy overview on the deformation behaviour of a material. Please read (https://www.fea-solutions.co.uk/stress-strain-curves/) for information on how Stress-Strain Curves are generated. For many materials, the Stress-Strain Curve is a straight line up to the Yield point. Such a behaviour is...

## 10 May 2019Elasticity and Plasticity

Elasticity is the deformation of a solid material that is completely reversed once the external load that has caused the deformation has been removed. That means, after removing the external load, the part is again undeformed. Plasticity in contrary is the non-reversible deformation of a solid...