This example uses a rubber membrane with 48 elements. The data is from the biaxial rig. See examples 714 & 715 for material parameter estimation using this geometry.
#PJH 30June1998 #Evaluate deformation of rubber membrane using 48 elements # fem #change environment fem de data;r;rubber0;example #define data points for undeformed sample #fem list data #lists undeformed data fem de window #define display window fem dr data #draw undeformed data refresh graphics fem de nodes;r;mesh;example #read 69 undeformed nodes fem de base;r;mesh;example #read basis functions (bilinear & simplex) fem de elem;r;mesh;example #read 48 elements fem dr lines rgb=blue #draw undeformed mesh refresh graphics fem de fibre;d #define fibre direction fem de element;d fibre #define elements for fibres fem de field;r;mesh;example #define 2 field variables fem de element;r;mesh;example field #define field elements fem de xi;c contain #calculate xi location of initial mesh #fem list data #list data x,y and xi position fem draw data trace #draw xi locations on inital mesh refresh graphics #---------------------------------------------------------------------- fem de equation;r;mesh;example #define finite elasticity problem fem de fit;r;mesh;example geom #linear fit with smoothing #----------------------------data set 5-------------------------------- fem de data;r;rubber5;example #read deformed data points fem draw data #draw new data set (deformed) fem dr data projection #data pts projected onto old mesh refresh graphics fem fit #fit nodes to data fem update solution field 1,2 #put field values into solution arrays fem dr line deformed rgb=red #deformed mesh fem de no;w;coord5 dep 1 #write deformed coords to coord5.ipnode #----------------------------data set 9-------------------------------- fem de data;r;rubber9;example #read another set of deformed data pts fem draw data #draw new data set (deformed) fem dr data projection #data pts projected onto old mesh refresh graphics fem fit #fit nodes to data fem update solution field 1,2 #put field values into solution arrays fem dr line deformed rgb=red #deformed mesh fem de no;w;coord9 dep 1 #write deformed coords to coord9.ipnode #---------------------------------------------------------------------- #fem list nodes #field vars have new nodal field values fem list strain elem 1 #strain in elem 1 calculated from xp and zp #fem list strain;straindata data table reference #list strain calculation in fem update geometry from field #this overwrites original mesh (strains now 0) fem dr data trace #Xi positions on new mesh fem dr data projection fem draw strain vectors data scale 0.05 #strain eigenvectors at data pts refresh graphics #fem list data;fiterrors errors full #list errors in fit into file "fiterrors"
Name Modified Size
example_21c.com 14-May-2003 2.9k coord5.ipnode 10-Apr-2000 10k coord9.ipnode 10-Apr-2000 10k deformed.ipnode 10-Apr-2000 123 mesh.ipbase 10-Apr-2000 2.0k mesh.ipelem 10-Apr-2000 12k mesh.ipelfd 10-Apr-2000 10k mesh.ipequa 02-May-2004 1.8k mesh.ipfiel 10-Apr-2000 10k mesh.ipfit 13-Apr-2007 1.9k mesh.ipmate 10-Apr-2000 2.3k mesh.ipnode 10-Apr-2000 8.5k rubber0.ipdata 10-Apr-2000 8.7k rubber2.ipdata 10-Apr-2000 26k rubber5.ipdata 10-Apr-2000 8.7k rubber9.ipdata 10-Apr-2000 8.7k
Name Modified Size
examples_2_21_21c.tar.gz 14-Apr-2007 26k
Html last generated: Sun Mar 6 05:50:10 2016
Input last modified: Fri Apr 13 10:30:48 2007