Main Help → All Commands → Explicit Cracks → GrowCrackLine
The GrowCrackLine
command is used when defining cracks in an MPM problem.
GrowCrackLine (x2),(y2),(segs),<(mat)>,<(tract)>
where
(x2)
and (y2)
define the coordinates of a point along the crack (or (R,Z)
coordinates if axisymmetric) in length units. A line will be drawn from the previous point to this new point.(segs)
is the number of crack segments to create along the line. The recommendation is that crack segment lengths be comparable to, or less than, the width of the elements in the mesh.(mat)
can be used to define a material ID for a previously defined material that contains the crack tip at the end of the crack or can be "exterior
" to indicate a crack to the edge of the body (see OSUPDocs wiki for details on "exterior
" cracks). Crack propagation is only possible when the crack tips have a material ID. If the material ID is omitted, the MPM calculations will correctly model that crack, but no propagation or fracture parameter calculations will occur. A crack tip material is only needed if the GrowCrackLine
command is the last crack definition command for the current crack.(tract)
can assign a traction law to all particles on the line. Set (tract)
to a material ID for a previously defined traction law material. To set a traction law material but no crack tip material in (mat)
, set (mat)
to "0" (or any invalid material ID).GrowCrackLIne
command is only allowed for MPM analyses.