Run Control

Yield at Multiple Joint Angles Example

The following is a simplification of “Uniaxial Compressive Strength of a Jointed Material Sample” (See FLAC3D/Index: FLAC3D Examples in the Help). Eighteen model runs are made under FISH control to create a plot of failure stress versus joint angle (which is increased by five degrees with each run, starting from 0). The entire data file required is shown below:

Before the data file is run, the 2D extrusion tool is used to create a cylinder cross-section that is extruded in the y direction. The extrusion set and the zones created from it are shown below.

Next the State Record Pane (new in version 6.0) is used to create a data file that recreates this result (the file is named cylinder.f3dat — called in the first line of the data file above). Next a FISH function that measures stress at the end of the cylinder and stores the result in a table is written and saved as measure.f3fis (this is called on the second line of the data file above and is shown at the end of this example, for reference).

With these two preliminaries in hand, the data file can be run, and the following is produced from the result table (see data file below):

Note that in the actual verification problem the applied boundary conditions use a FISH servo to optimize convergence accuracy and the result is compared against an analytical solution calculated via FISH.

[1] All program documentation for FLAC3D is installed with the free demonstration version of the program available on this site, for those who are interested in exploring this material in greater depth.

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