What is Fem: Definition and 86 Discussions

Fem2Fem was an American techno group in the 1990s who released three albums. With actress Lezlie Deane of Freddy's Dead: The Final Nightmare as a member, Fem2Fem were the first and openly lesbian pop group to chart, although the band did contain straight women in addition to open homosexuals. But only some of the members of Fem2Fem were lesbians, and according to Michelle Crispin their intentions at the beginning were to promote a healthy view of sexuality with their music, regardless of sexual orientation. However, an appearance by the band in the December 1993 issue of Playboy magazine and the non-political nature of their sapphic lyrics led to criticism by some in the LGBT community that the band was trying to make a fast buck off playing to the prurient interests of a heterosexual male audience.

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  1. M

    Algorithm for assembling quadrilateral mesh in FEM

    Hi all, I have co-ordinates of 4 vertices of quadrilateral for every element in mesh. I assembled such elements by moving single, separate point in whole domain and compared it's coordinate with all vertices of quadrilateral. Above technique work properly, but it required rectangle element...
  2. M

    How to generate functional in FEM

    Please suggest me, how to generate weak form or functional of any partial diffrential equation ( mostely second order) in Finite Element Method. Thanks in advance.
  3. R

    Node numbering scheme for Fem problems

    Dear All, How important is the node numbering scheme for simple fem problems or is it important at all? It will be much easier to explain that by example, if I have following linear algebraic equations to solve with direct stiffness method \ K*\left\{X\right\}=F where K global stiffness...
  4. P

    Beam deformation. FEM (solidmechanics)

    Homework Statement I have this question. I need to know the diformation in P direction. Here is the question I use the symmetry and finally with a 1/4 modell I get the following: which is correct according to the instruction. K is the stiffness of the spring. which with symmetry becomes...
  5. K

    Linear Spring System - Equations of Motion

    This is not exactly a HW problem but a worked out problem that I am trying to understand. Below pictures are from Hutton's "Fundamentals of Finite Element Analysis" Homework Statement Derivation of system of equations for given figure. Homework Equations 3. What confuses me From the...
  6. J

    Have you tried the free FEM solver iPad app for structural engineering?

    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...
  7. S

    Finding Electric Potential Gradient in 3D FEM Mesh

    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...
  8. B

    Partial Differentiation with Indicial Notation (Ritz Method for FEM)

    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...
  9. B

    FEM: Rank deficiency and hourglassing

    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...
  10. R

    2-node Frame FEM element thermal formulation

    \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...
  11. B

    How can I gain practical proficiency in FEM for a career in FEA?

    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...
  12. R

    FEM derivation for plates on elastic foundation ?

    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...
  13. A

    How to Implement FEM with a Discontinuity in the Exact Solution?

    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...
  14. C

    FEM tools like MAXWELL , FLUX , MOTOR CAD

    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
  15. J

    Solving for tensile test(materials) in FEM software

    Homework Statement I have to solve for the stress-strain curve of a tensile test(materials science) given the following data: d0 = 10 [mm]; d=9.925[mm] (average after d1' and d1'') and L0 = 100[mm]; I have already solved the problem and charted the diagrams. But I would be most grateful if...
  16. D

    Shape Functions FEM Homework: Derive Displacement Functions 2-10 to 2-13

    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...
  17. B

    FEM - lax friedrichs two step method

    hi i have written a code which according to my tutor is the lax friedrichs two step technique , however i can't see how to show how i came across this code (i kinda changed random things and hoped at some point he would say its correct. thanks for any help in advance kyle :) source for...
  18. P

    Stability of a FEM solution to NS equations

    I'm looking for a numerical stability and error estimation of a finite element approximation of Navier-Stokes equations (with combustion). I define variables and operators on a domain that has both space and time axes (Ω = Ωs x [0,tmax]), so the transport equation looks generally like this...
  19. G

    Msc computational engineering (FEM) or Msc financial engineering

    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...
  20. B

    MBS (SIMPACK) or FEM (Abaqus)

    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...
  21. Z

    FEM software? Poisson equation: Boundary conditions for a charged boundary

    Hi all, I want to calculate the electrostatic potential for an two-dimensional area with given Dirichlet boundary conditions (say, a square) with a charged ring in it (like a wedding ring, but inifinitely thin) with a given line charge density. I figured out that the problem should be...
  22. J

    Why are the natural frequencies of a clamped-clamped beam smaller than usual?

    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...
  23. N

    FEM Clarification: What is a Linear Element?

    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?
  24. P

    MATLAB FEM for natural frequencies and mode shapes of a beam

    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...
  25. R

    Boundary Conditions for Pressurized Cylinder in FEM

    boundary conditions for pressurized cylinder in fem?
  26. K

    Modeling pressure distribution 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
  27. K

    FEM Book for Beginners: Find Tutorials & Links

    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.
  28. G

    The difference between the H and P methods in FEM

    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
  29. H

    FEM for Gearbox Design: Key Input Data for Finite Element Method Analysis

    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
  30. P

    FEM - mesh generator, transition elements

    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...
  31. G

    FEM: Local lumped mass matrices for elements on no slip boundaries.

    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...
  32. A

    New to Maxwell & FEM: Magnetostatic Analysis for Solenoid Valve

    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...
  33. radou

    FEM modelling of a cantilever beam

    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...
  34. J

    FEM for composites in SolidWorks

    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.
  35. C

    FEM and PDE: Solving a Simple Falling Mass Differential Equation

    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...
  36. A

    Solving Propagation Constant for Inhomogeneously Filled Rectangular Waveguide

    I am having some serious problems in solving for the propagation constant of a inhomogeneously filled rectangular waveguide... The dimensions that I am using are a = 2.22(along x-axis) and b = 1.0(along y axis) and the dielectric filled in half the region has a dielectric constant of...
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