Fem Definition and 76 Threads

I have just finished my master thesis developing an iPad app for educational purposes. It's completely free and it can be used to solve problems using FEM beam elements, intuitive to use and works in a playful way without any numbers just to help users get a feel for different constructions and...

Hello, The value of electric potential(∅) is known at every node in a 3d finite element mesh. The relation between electric current density(i) and electric potential(∅) is i=k.∇∅, I am writing a code in c, I want to know how to find the gradient of electric potential(∇∅) at every node so...

Folks, I am stuck on an example which is partial differenting a functional with indicial notation The functional ##\displaystyle I(c_1,c_2,...c_N)=\frac{1}{2} \int_0^1 \left [ \left (\sum\limits_{j=1}^N c_j \frac{d \phi_j}{dx}\right )^2-\left(\sum\limits_{j=1}^N c_j \phi_j\right)^2+2x^2...

Hello, I am having somewhat difficulty understanding the concepts of rank deficiency and hourglassing in finite element methods. Essentially, I have been reading a book outlining this very briefly on half a page and I need a bit more information. As an example: If we have a 2D elasticity...

\inthi all, I need just little bit of confirmation about what I'm doing. Normally I know how the stiffness matrix is composed for 2 node frame element in 3D space. which creates 12x12 matrix for that element, if there is also thermal loading on frame element additional...

Hello Everyone, I've got a background in engineering, having studied quite a bit of finite elements (mainly for solid mech) at university and am thinking of moving into FEA as a career. However, I've always found that, in spite of studying FE books at university and at home, I don't seem to...

Hi All, I'm familiar with the theory of how the soil can represented by means of FEM and how soil-structure interaction is being established. Most of books are pointing out at the Winkler -springs implemented mostly for beams and quadrilaterals (4 node) FEM elements. There are obviously...

Homework Statement Use FEM to solve this problem. The difficulty lies in the fact that the exact solution has a discontinuity in it. From x=[0,0.6) the exact solution u is x5/20 - x/20 and from x =(0.6,1] u is sin(x). The problem I'm having is I'm not sure what to do at the jump in my code...

Hi all, I want to learn tools like MAXWELL 2d 3d , MAGNET, FLUX etc. I want to know if I'll need to know CAD and FEM Analysis to learn the above mentioned tools. Thankyou, Chaitanya

Homework Statement http://img545.imageshack.us/img545/8149/13862239.png The displacement functions:http://img256.imageshack.us/img256/2743/13939694.png Derive the displacement functions 2-10 up to 2-13. Homework Equations Third cubic polynomial and elementary beam theoryThe Attempt at a...

Hello and nice finding you!For a long time now I am thinking of financial markets and the world of derivatives as a very good future opportunity.Since I am a ''computational guy'' and in love with the finite element analysis,I decided to let my mind go of the Msc in geotechnical engineering and...

I am working on a project of developing a Flywheel energy storage (powered by electric motor) for a vehicle. The natural frequency of the system has to be calculated. Simple project description: The flywheel is held by two bearings inside a housing. The electric motor is fixed to the...

Hello, I recently used Matlab to find the natural frequencies of a clamped-clamped beam. It was fairly simple, as I construct the global mass and stiffness matrices. Then it's just a matter of using the eig() function. (For sake of simplicity I put beam properties all to 1.) When I choose how...

Hi In my book on FEM they talk about "linear elements" (in 1D). My question is: When is a finite element considered linear? Is it when the shape (interpolation) functions are linear in the 1D variable? Is it when the trial function is linear in the 1D variable?

Homework Statement Model the above beam with 3 elements(image provided in attachment). Calculate and list the first 6 natural frequencies Plot the mode shapes corresponding to each of the natural frequencies Homework Equations DET(M^{-1}*K + [I] \omega^2)=0 shape functions...

boundary conditions for pressurized cylinder in fem?

Hi guys. I want to model the pressure distribution in rolling process and convert the pressure distribution into equivalent nodal forces. How do I do it. Please guys it's urgent. Any links would also help. Thanks

hi every one. can anyone suggest me a good book on finite element method? i am a beginner and want to clear my basics about the subject. online links and tutorials would also help. thanks in advance.

Hi I want to know what's the difference between the H and P method solutions for static analysis problems, if you can explain it to me? Thanks for your help

hello alll I am designing a gearbox for milling machine. For Finite element Method purpose, what are the input data (such as cutting force, spindle speed or load torsion moment) most influencing to structure of the gearbox? I am using FEM software for calculating the structure of this gearbox

FEM -- mesh generator, transition elements Hello, I would like to implement 2D mesh generator. Mesh should consists of triangle and rectangle elements and those triangle elements will play a role of transition elements. The example of such mesh is here: http://pkow.pl/transition_element.jpg...

I am trying to debug a SUPG FEM code for flow problems (based on Brooks Hughes 1982) and have a question about the Lumped Mass Matrix. My understanding of the Lumped Mass Matrix is that for any given element the mass of that element is simply distributed evenly over the number of nodes. In...

Dear all, I'm a new user to Maxwell and to FEM. I am trying to do a magnetostatic analysis for a solenoid valve for finding inductance and force on the armature. I am facing few problems while making the simulation. 1. what value shall I assign for the source? (In the tutorial provided by...

Due to complications I have with drawing and uploading pics at the moment, I'll simply describe the model instead of posting a pic; it's a cantilever beam (ignore the cross section and modulus of elasticity given in the pic, and the force P) of length L = 1, the coordinate axis x is along the...

Anybody know how this is done? I want to do a stress analysis on a wing design, but COSMOSXpress yells at me when I choose to use a composite material.

i want to understand finite element method by solving the simple differential equation of falling mass d2y/dx2=force/mass eventhough this equation contains derivative of only one variable i want to understand fem using this Or some one can give a somemore difficult pde and solve using...