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Please go to SLFFEA HOME, which
has a complete FEA package I developed and released under the GNU
license. This page is no longer relevant.
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This page used to be the source code page for my simple truss program,
but now I use it so you can see an example of the code I have written.
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This is the
Makefile : It links the individual modules
together.
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There are 10 program modules:
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femtruss.c : This is the main program. It does
the memory allocation, variable definition, user request, and
function calling.
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tsreader.c
This program reads in the data for
the problem.
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tsidlm.c
This program assembles the id
and lm arrays. The id array assigns the degrees of freedom per
node. The lm array assigns degrees of freedom per element.
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dotx.c
This program takes the dot product of 2 vectors.
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tsidiag.c
This program assembles the
idiag array. This array is used for keeping track of the column
heights of a global stiffness matrix stored in skyline form.
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tskasmbl.c
This program assembles
the stiffness matrix in skyline form. It also will be called
after the analysis is completed for calculation of the reaction
forces.
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matx.c
This program does matrix
multiplication.
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matxt.c
This program does matrix
multiplication after transposing the first matrix.
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sky.c
This program performs LU
decomposition on a skylined matrix. It also has a subroutine
to solve the skylined system.
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tswriter.c
This program writes out the data to a file *.ots
after analysis is complete.
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There are 2 include files:
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tsconst.h
This is the include file
that defines all the constants of the program.
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tsstruct.h
This is the include file
which defines all the structures used for the program.
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This is an example of a truss input file:
ts3_6.txt
This file is taken from example 3.6 on page 77 in the book, A
First Course in the Finite Element Method 2nd Ed. by
Daryl L. Logan, published in 1992 by PWS-KENT.
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