needleman_debonding#
Description#
This behavior 1this behavior is Z-set specific, and therefore does not apply for
Z-mat for other codes is used for the special problem of interface
debonding. See the command **create_interface_elements
(and similar)
in the Z-set user manual on how to insert cohesive elements in the mesh.
The Needleman model 2Needleman A., “A continuum model for void nucleation by inclusion
debonding”, J. of Applied Mechanics, 54 (1987), pp. 525-531. is described through a scalar variable
where
with
with
Fig. 12 Example in two dimensions of the evolution of the cohesive traction as a
function of the opening displacement, for two different loading cases:
Syntax#
***behavior needleman_debonding
sigmax
deltan
deltat
alpha
alphac
[no_penetration]
If no_penetration
is specified, a broken element continues to
prevent penetration.
Example#
***behavior needleman_debonding
sigmax 100.
deltan 1.e-5
deltat 1.e-5
alpha 1.
alphac 1.e3
***return