Example 411: A truss problem

This problem solves for the displacements, tensions and reaction forces in a statically determinant 3 member truss. The truss invesigated is analysed in the notes.

The comfile run by this example is as follows:

#Example_411 A truss problem
 
fem                            #set up the FEM environment
fem define nodes;r;truss;example   #read the truss nodes
fem define window;c            #calculate the window size
fem define bases;r;;example        #defines a linear basis function
fem define elements;r;;example     #defines three elements
fem draw lines                 #make the line segments visible
fem draw nodes                 #make the node numbers visible
fem define fibre;d             #default fibre angle
fem define element;r;;example fibre
fem define equation;r;;example     #this is a static analysis using
#                              !  linear elasticity with truss
#                              !  elements.
fem define material;r;;example     #define the material parameters. Define
#                              !  an isotropic material with a Young's
#                              !  modulus of 10 GPa, and a cross-
#                              !  area of 5 cm^2
fem list material              #list the material parameters
fem define initial;r;;example      #define initial and boundary conditions
#                              !  for the problem.
fem draw nodes                 #make the node numbers visible and show
#                              !  fixed boundary conditions.
fem define solve;r;;example        #define the solver options
fem solve                      #solves the boundary value problem
fem draw line deformed dotted scale 0.05 #draws (scaled) deformed
#                              !  body with dotted lines
fem list node solution         #list the nodal displacements
fem list node reaction         #list the nodal reactions (forces)
fem list stress full           #list the element stresses
fem draw reaction scale 0.003  #draw (scaled) reaction (force) vectors

Additional testing commands:

fem list node solution
fem list node reaction
fem list stress full

Files used by this example are:

Name             Modified     Size

example_411.com  13-Dec-2002  1.8k
test_output.com  13-Dec-2002   67 
truss.ipbase     10-Apr-2000  893 
truss.ipelem     10-Apr-2000  833 
truss.ipelfb     10-Apr-2000  491 
truss.ipequa     26-May-2003  1.7k
truss.ipinit     10-Apr-2000  686 
truss.ipmate     10-Apr-2000  800 
truss.ipnode     10-Apr-2000  727 
truss.ipsolv     13-Apr-2007  1.1k

Download the entire example:

Name                      Modified     Size

examples_4_41_411.tar.gz  23-Jul-2009  5.1k

Testing status by version:

Testing status by file:

• cmiss_test.log
  

  i686-linux
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.
  mips-irix
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.
  Success	cm-debug-clear-malloc:	cmiss_test.log.retain.
  Success	cm-debug-clear-malloc7:	cmiss_test.log.retain.
  Success	cm64:	cmiss_test.log.retain.
  Success	cm64-debug:	cmiss_test.log.retain.
  Success	cm64-debug-clear-malloc:	cmiss_test.log.retain.
  rs6000-aix
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.
  Success	cm64:	cmiss_test.log.retain.
  Success	cm64-debug:	cmiss_test.log.retain.
  x86_64-linux
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.

  
  
• cmiss_test.out
  

  i686-linux
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.
  mips-irix
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.
  Success	cm-debug-clear-malloc:	ndiff test: no significant differences with generic answer.
  Success	cm-debug-clear-malloc7:	ndiff test: no significant differences with generic answer.
  Success	cm64:	ndiff test: no significant differences with generic answer.
  Success	cm64-debug:	ndiff test: no significant differences with generic answer.
  Success	cm64-debug-clear-malloc:	ndiff test: no significant differences with generic answer.
  rs6000-aix
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.
  Success	cm64:	ndiff test: no significant differences with generic answer.
  Success	cm64-debug:	ndiff test: no significant differences with generic answer.
  x86_64-linux
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.

  
  

Html last generated: Sun Mar 6 05:50:20 2016

Input last modified: Wed Jul 22 08:51:16 2009