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Non-linear contact is one of the three non-linear behaviours in structural analysis, see: https://www.fea-solutions.co.uk/non-linear-behaviour/ Non-linear contact is required where the load path between parts of an assembly is affected by the load direction. A typical example where non-linear contact has to be taken into account is a bolted...

Large deformation, or geometric non-linearity, is one of the three non-linear behaviours in structural analysis, see: https://www.fea-solutions.co.uk/non-linear-behaviour/ In linear analysis, the equilibrium of forces (and moments) is established on the undeformed structure. That means, although one of the results of the FEA are deformations, the calculation has...

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: https://www.fea-solutions.co.uk/elasticity-and-plasticity/ Viscoelasticity This is...

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...

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...

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 ductile materials...

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,...

The data obtained from a Tensile Test are forces and displacements. https://www.fea-solutions.co.uk/tensile-tests/ 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 Stress. Engineering Stress...

In Hooke's Law, the Spring Constant k describes the relation between an applied load and the resulting deformation of a body. https://www.fea-solutions.co.uk/law-of-elasticity/ 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 material...

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...