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FEM: CalculiX writer comments regarding load calculation algorithm

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This commit is contained in:
Bernd Hahnebach 2015-09-15 15:30:15 +02:00
parent 4f31fc44e6
commit 75fbb93180
1 changed files with 6 additions and 3 deletions
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9
src/Mod/Fem/ccxInpWriter.py
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@ -102,9 +102,9 @@ class inp_writer:
# calculate node load
if NbrForceNodes != 0:
fobj['NodeLoad'] = (frc_obj.Force) / NbrForceNodes
# FIXME this method is incorrect, but we don't have anything else right now
# Please refer to thread "CLOAD and DLOAD for the detailed description
# http://forum.freecadweb.org/viewtopic.php?f=18&t=10692
# FIXME for loads on edges the node count is used to distribute the load on the edges.
# In case of a not uniform fem mesh this could result in wrong force distribution
# and thus in wrong analysis results. see def write_constraints_force()
f.write('** concentrated load [N] distributed on all mesh nodes of the given shapes\n')
f.write('** ' + str(frc_obj.Force) + ' N / ' + str(NbrForceNodes) + ' Nodes = ' + str(fobj['NodeLoad']) + ' N on each node\n')
if frc_obj.Force == 0:
@ -223,6 +223,9 @@ class inp_writer:
# calulate the appropriate node_areas for every node of every mesh face (mf)
# G. Lakshmi Narasaiah, Finite Element Analysis, p206ff
# FIXME only gives exact results in case of a real triangle. If for S6 or C3D10 elements
# the midnodes are not on the line between the end nodes the area will not be a triangle
# see http://forum.freecadweb.org/viewtopic.php?f=18&t=10939&start=40#p91355 and ff
# [ (nodeID,Area), ... , (nodeID,Area) ] some nodes will have more than one entry
node_area_table = []