# block fragment command

Syntax

block fragment <keyword> <range>

Primary keywords:

Commands for computing and manipulating fragment data as described below.

compute

Computes the set of fragments in a model. A fragment is defined as a group of blocks connected by intact subcontacts. An intact subcontact is a subcontact that has not failed in tension or shear (state = 0) and has a non-zero cohesion or tensile strength. If any subcontact between two blocks is intact, then the blocks are considered part of the same fragment.

fill-extra i

Put fragment numbers into block extra variable index i (if the slot is omitted, the command uses i = 1 by default).

fill-group slot s <maximum i >

Takes the computed fragments and assigns block group names in group slot s. This is done to enable plotting of fragments in different colors. The optional keyword maximum sets the maximum number of groups to i. If the number of fragments is greater than i, then the group names will repeat.

dump <filename s >

Outputs information associated with the fragments to a file with file name s (default = “fragments.txt”). Currently the fragment number, fragment volume, fragment surface area and number of blocks in the fragment is output.