A Finite Element Program (FECGS): Post-Processor FEPOST - GKSS

Chapter 1
GENERAL FEATURES
1.1 Introduction
FEPOST is part of finite element program system (FECGS) for the purpose of post-processing
the results files. FEPOST is executed uninteractively by providing a file of commands. The
present version is available for the IBM workstation RISC 6000. The main input of the program
is a file which indicates the options required, and gives the data associated with those options.
Current version of FEPOST is also able to process the output file (.fil) from a finite element
analysis run by ABAQUS using the commands *NODE FILE, . . . , and *EL FILE, . . . . FEPOST
deals only with nodal variables provided by a FE analysis. For the element variables, FEPOST
will interpolate the element variables from the gauss points to the element nodes. Thus, the
element varibles from an analysis run by ABAQUS should be recorded in the gauss integration
points.
Major capabilities of FEPOST include:
• Tabulating results.
– Tabulating a list of quantities, e.g. displacements at given coordinates, summing the
nodal reaction force up for a given array of nodes, averaging stresses and strains over
a material volume etc.
– Displacement along a given curve (referring to displacement profile).
– Distribution of solution variables along a given curve, for examples, the stresses dis-
tribution.
– Q-stress at a given point or along a curve (a special option for the purpose of fracture
mechancs).