Index to Common MESH Phase Commands FEAP 7.1

Appendix A

 

Boundary Codes

Command Description Page
angle Input the angle a local coordinate system makes with respect to the global coordinates system at a given node. Boundary conditions at the node are then assumed to be given in this local coordinate system. 121
boundary  Input the boundary codes for specific nodes. 129
cangle  Like angle but sets the angle of the local coordinate system for nodes on a user defined curve (linear or quadratic) or at a given coordinate location. 133
cboundary  Like boundary but permits the entry of boundary codes along a user defined curve (linear or quadratic) or at a given coordinate location. 136
eangle  Like angle but sets the angle of a local coordinate system for all nodes with a common value of a given coordinate direction; e.g. sets angle for all nodes which have x_2=6. 152
eboundary  Like boundary but permits the entry of boundary codes for all nodes with a common value of a given coordinate direction; e.g. sets boundary codes for all nodes which have x_2=6. 153
reset  Zero all boundary codes. This useful for problems with changing boundary conditions. 180

Boundary Values

Command Description Page
cdisplacement  Like dispplacement but permits the entry of nodal displacements along a user defined curve (linear or quadratic) or at a given coordinate location.  139
cforce  Like force but permits the entry of nodal forces along a user defined curve (linear or quadratic) or at a given coordinate location.  141
csurface  Input normal and/or shear traction boundary conditions along a user defined curve (linear or quadratic). Traction variation can be uniform, linear, or quadratic. [A displacement option is also available.]  147
displacement  Input the nodal displacement values for individual nodes.  151
edisplacement  Like displacement but sets nodal displacements for all nodes with a common value of a given coordinate direction; {\it e.g.} sets boundary values for all nodes which have $x_2=6$.  154
eforce  Like force but sets nodal forces for all nodes with a common value of a given coordinate direction; {\it e.g.} sets boundary values for all nodes which have $x_2=6$.  155
force  Input the nodal force values for individual nodes.  162

Coordinate Systems

Command Description Page
polar  Converts nodal coordinates that have been entered in a polar coordinate system to the global Cartesian coordinate system used by FEAP.  175
shift  Translates origin of coordinate system during mesh definition.  185
spherical Converts nodal coordinates that have been entered in a spherical coordinate system to the global Cartesian coordinate system used by FEAP.  190
transform  Transform the coordinate system during mesh definition with a linear transformation.  196

Discrete Boundary Conditions

Command Description Page
damper  Input the damping constants of nodal dampers that are connected to earth (ground). 150
mass Input the mass values of nodal masses. 167
stiffness  Input the stiffnesses of nodal springs that are connected to earth (ground). 191

Material Properties

Command Description Page
material Input material properties and the association between material identifier numbers and element types. 168

Mesh Definition

Command Description Page
block  Generate a patch of quadrilateral, triangular, or hexahedral elements and nodes. All elements will have the same material identifier number. 124
coordinate  Input the location of individual nodes. 146
element  Input individual element numbers and mapping between local and global node numbers (i.e. LM array) plus material identifier number for each element. 156
region  Set region number of mesh parts for use with activate and deactivate during problem solution and for use with tie 179
tie Merge/tie mesh parts together when duplicate node numbers have been defined at a single point during mesh generation. 212

Output Control

Command Description Page
noprint  Suppresses printing of mesh data in output file. 171
print  Resume printing of mesh data in output file; opposite of noprint. 176

Problem Specification

Command Description Page
end Delimit end of MESH phase input 158
feap Define global parameters such as number of nodal points, number of elements, spatial dimension of problem, etc. 119
global  Globally set analysis type to plane stress/strain or axis-symmetric. 164
include  Include a file into the mesh. Similar to read. 165
stop Delimit end of file. Commands below the stop are not read.
parameter  Define the values associated with single character variables used in FEAP input file. 172