2 THE
Z88 MODULES
2.1 THE
DIRECT CHOLESKY SOLVER Z88F
NOTE:
Always
compare FEA calculations with analytical rough calculations, results of
experiments, plausibility considerations and other tests without exeption !
The principal task of every
FEA program is the calculation of the displacements. That's the job of Z88F.
The calculated deflections are the starting point for a stress calculation with
Z88D or nodal force calculation with Z88E.
Z88F is the right solver
for small to medium structures. For large structures launch the iteration
solver Z88I1 and Z88I2.
For the displacement
calculation the FE processor Z88F can be started in different modes. This is
chosen in Z88F in the Mode menu. Compact Mode is provided as default.
Note: The files Z88I1.TXT , Z88I2.TXT and Z88I5.TXT
mentioned here are described more precisely in chapter 3.
(1)
Compute Mode
Windows:
Z88F > Mode > Compute Mode, Compute > Go
UNIX:
z88f -c (console) or Z88F with option -C (Z88COM)
Input files:
Z88I1.TXT (general
structure data)
Z88I2.TXT (boundary conditions, constraints)
Z88I5.TXT (surface and pressure loads), if needed
Output files:
Z88O0.TXT
(processed structure data for documentation)
Z88O1.TXT (processed boundary conditions for documentation)
Z88O2.TXT (deflections)
In addition two binary
files Z88O1.BNY and Z88O3.BNY are generated. These binary files are later used
by Z88D (stress processor) and Z88E (nodal force processor).
(2) Test Mode
Windows:
Z88F > Mode > Test Mode, Compute > Go
UNIX:
z88f -t (console) or Z88F with option -T (Z88COM)
Input files:
Z88I1.TXT (general
structure data)
Output files:
Z88O0.TXT
(processed structure data for documentation)
Only the file Z88O0.TXT
(processed structure data for documentation) is produced along with the memory
needs for total stiffness matrix and coincidence vector plotted on the screen. Use
this mode for
> Checking the memory needs for MAXGS and MAXKOI.
> Checking if Z88F interprets Z88I1.TXT correctly and, as requested, puts
the data in Z88O0.TXT.