A finite element method is characterized by a variational formulationa discretization strategy, one or more solution algorithms and post-processing procedures.
The principle of virtual displacements for the structural system expresses the mathematical identity of external and internal virtual work: Courant  in the early s. There are various numerical solution algorithms that can be classified into two broad categories; direct and iterative solvers.
Straight elements usually have two nodes, one at each end, while curved elements will need at least three nodes including the end-nodes. Each discretization strategy has certain advantages and disadvantages.
This spatial transformation includes appropriate orientation adjustments as applied in relation to the reference coordinate system.
Finite element concepts were developed based on engineering methods in s. Examples of discretization strategies are the h-version, p-versionhp-versionx-FEMisogeometric analysisetc. Free course Introduction to finite element analysis 1. Hrennikoff  and R.
Colours indicate that the analyst has set material properties for each zone, in this case a conducting wire coil in orange; a ferromagnetic component perhaps iron in light blue; and air in grey.
FEA is a good choice for Finite element analysis problems over complicated domains like cars and oil pipelineswhen the domain changes as during a solid state reaction with a moving boundarywhen the desired precision varies over the entire domain, or when the solution lacks smoothness.
It includes the use of mesh generation techniques for dividing a complex problem into small elements, as well as the use of software program coded with FEM algorithm. When the nodes displace, they will drag the elements along in a certain manner dictated by the element formulation.
Three-dimensional elements for modeling 3-D solids such as machine components, damsembankments or soil masses. The process eliminates all the spatial derivatives from the PDE, thus approximating the PDE locally with a set of ordinary differential equations for transient problems.
Element interconnection and displacement[ edit ] The elements are interconnected only at the exterior nodes, and altogether they should cover the entire domain as accurately as possible. Proper support constraints are imposed with special attention paid to nodes on symmetry axes.
Although the geometry may seem simple, it would be very challenging to calculate the magnetic field for this setup without FEM software, using equations alone. Another example would be in numerical weather predictionwhere it is more important to have accurate predictions over developing highly nonlinear phenomena such as tropical cyclones in the atmosphere, or eddies in the ocean rather than relatively calm areas.
The subdivision of a whole domain into simpler parts has several advantages: In the USSR, the introduction of the practical application of the method is usually connected with name of Leonard Oganesyan. This may seem to be a bit of a liberty, but it can be surprisingly close to reality.
Examples could be a component under load, temperatures subject to a heat input, etc. The elements are positioned at the centroidal axis of the actual members. An example is illustrated in Figure 1. History[ edit ] The origin of finite method can be traced to the matrix analysis of structures   where the concept of a displacement or stiffness matrix approach was introduced.
FEA as applied in engineering is a computational tool for performing engineering analysis. Earlier books such as by Zienkiewicz  and more recent books such as by Yang  give comprehensive summary of developments in finite-element structural analysis.
From the application point of view, it is important to model the system such that: FEM solution to the problem at left, involving a cylindrically shaped magnetic shield.
The finite element method obtained its real impetus in the s and s by John Argyrisand co-workers; at the University of Stuttgartby Ray Finite element analysis. The color represents the amplitude of the magnetic flux densityas indicated by the scale in the inset legend, red being high amplitude.
In other words, displacements of any points in the element will be interpolated from the nodal displacements, and this is the main reason for the approximate nature of the solution.The finite element method (FEM), or finite element analysis (FEA), is a computational technique used to obtain approximate solutions of boundary value problems in engineering.
Introduction to finite element analysis. This free course is available to start right now. Review the full course description and key learning outcomes and create an account and enrol if you want a free statement of participation.
The extended finite element method (XFEM) is a numerical technique based on the generalized finite element method (GFEM) and the partition of unity method (PUM). It extends the classical finite element method by enriching the solution space for solutions to differential equations with discontinuous functions.
Finite element analysis requires a working knowledge of stress analysis and materials principles to get the answer right - the first time. Our engineers are multi-disciplined in areas of materials, design, metallurgy and manufacturing - each with more than 25 years of experience.
For courses in Finite Element Analysis, offered in departments of Mechanical or Civil and Environmental Engineering.
While many good textbooks cover the theory of finite element modeling, Finite Element Analysis: Theory and Application with ANSYS is the only text available that incorporates ANSYS as an integral part of its content.
Moaveni presents the theory of finite element analysis /5(4). Finite element analysis shows whether a product will break, wear out, or work the way it was designed.
It is called analysis, but in the product development process, it is used to predict what is going to happen when the product is used.Download