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Cheat sheet for finite element
3

Cheat sheet for finite element

Cheat sheet for finite element

(OP)
Hello everybody

I was searching for a good cheat sheet for FEM to review it , but could n't find a good one , please if you have any access or link , or you can share it with me

RE: Cheat sheet for finite element

we don't like cheaters !

are you looking for a step-by-step guide for making an FEM ?

Quando Omni Flunkus Moritati

RE: Cheat sheet for finite element

or a check sheet?

RE: Cheat sheet for finite element

(OP)
ok , sorry , yes , I think the step by step guide , I want to make a code of 1D in Matlab , I just needed to have the FEM data at reach , if you have this guide or I should search it

RE: Cheat sheet for finite element

if you want to make your own code there are many texts that can help. the structures detail (for a 1D element) is pretty straightforward, the difficult stuff is in solving the matrix.

Quando Omni Flunkus Moritati

RE: Cheat sheet for finite element

(OP)
Thanks a lot for your responses

actually I was studying this file attached , on page 19 there is a function defined that I don't understand , I think the rest is straight forward , and if I undeerstand this 1D , the 2D would not be so much different , and what is the difficulty in solving the matrixes ?

I appreciate all the responses and answers

thank you very much

RE: Cheat sheet for finite element

i'm thinking that the structural aspects of FEA theory are pretty basic. i thought if you were writing your own code, then solving a very large marix gets involved (mathematically), but it looks like MATLAB does it for you (much like excel does).

what was on pg 19 that you couldn't follow ?

Quando Omni Flunkus Moritati

RE: Cheat sheet for finite element

(OP)

well I am trying to understand this code so will understand the Fem code writing well , just as a start , in that page the IEN and LM are two matrices calculated that for LM is written like :

global degree-of-freedom=LM (local degree-of-freedom, element number)

that when a node 's degree of freedom is one , the IEN and LM are identical , (why ?) , then I don't get the two dof node condition

RE: Cheat sheet for finite element

local dofs are based on the element, like axial load in a rod.
global dofs are based on an external co-ord system, ie components of rod load.

the element stiffness matrix is in terms of local dofs.
the structure stiffness matrix is in terms of global dofs.

that said i disagree with "when a node 's degree of freedom is one , the IEN and LM are identical".
global and local dofs are identical (IMO) if the element is aligned to a global axis.

Quando Omni Flunkus Moritati

RE: Cheat sheet for finite element

(OP)

Thank you for the responses , but I really wish somebody open the pdf file I uploaded and tell me what is happening step by step in the matlab file , I mean how we form the matrices and the solver , like page 21 , this could be a good guide for me to understand both coding and FEM steps

RE: Cheat sheet for finite element

(OP)
my problem is mostly the matrice assembly

RE: Cheat sheet for finite element

(OP)
thank you for your kind response , well yes , there are examples for one beam element or two connected in series together , but for example when it's a truss and nodes are connected to two or three other nodes , the shape of element stiffness matrix gets difference and I could not find a way yet to do this type and understand the algorithm well

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