Commit Graph

32 Commits

Author SHA1 Message Date
Christoph Kords f153866030 introduced factor to control edge contribution to multiplication;
dislocation density below a single dislocation per IP considered not significant
2012-09-04 16:56:37 +00:00
Christoph Kords d80b45c1d9 added relativistic correction of velocity (maximum velocity given by parameter in material.config); probability of thermal activation in velocity law not allowed to be greater than one.
output of creation rate for edge jogs now for own system, not collinear.
check for negative densities in dotState now uses absoluteToleranceRho instead of significantRho.
2012-08-30 07:33:13 +00:00
Christoph Kords aa380dcb08 added separate output of dipole formation rate for edge and screw 2012-08-27 15:57:22 +00:00
Christoph Kords 4f67d04c69 new parameter "significantRho" for nonlocal constitutive law ; density below this value will hardly contribute to dislocation glide or any dislocation reaction ; old parameter "absoluteToleranceRho" is now used only for its initial purpose, namely the absolute tolerance in the state integration 2012-08-23 05:48:21 +00:00
Christoph Kords b2aacf9ca4 rates in constitutive_results are taken directly from last converged step and not calculated again; added output of rates for annihilation of screws and deposition of edge jogs on collinear system 2012-08-16 11:03:22 +00:00
Christoph Kords bd754dbefd corrected debug output of evolution rates; added possibility to change the safety factor for the CFL flux condition via the material.config file; updated the example material.config due to recent changes in nonlocal constitutive 2012-08-16 09:13:38 +00:00
Franz Roters 823013d485 new plasticity: none
see material.config for necessary parameters (lattice_structure, elastic constants)
2012-07-03 11:16:38 +00:00
Nan Jia bbf790a0a5 Input parameter 'QedgePerSbSystem' which denotes activation energy for each shear band system is added 2012-05-22 16:10:28 +00:00
Martin Diehl 9a92d343dc added Onurs modified description for tausat in j2 law.
Polishing phenopowerlaw
2012-04-11 14:01:02 +00:00
Christoph Kords 5263366615 adding switch in material.config for short range stress correction 2012-03-15 14:58:12 +00:00
Christoph Kords 503f6ed040 i think it's elasticity not elaticity, right? 2012-03-15 08:46:51 +00:00
Franz Roters 36edb4dd9f introduced keyword elasticity in material.config
added constitutive_TandItsTangent and special version constitutive_hooke_TandItsTangent
those are however not yet used and need to be tested
2012-03-14 16:16:11 +00:00
Franz Roters c9ed989dad replaced keyword constitution with plasticity in preparation of upcomming generalized elasticity 2012-03-12 14:09:37 +00:00
Nan Jia 211f66a728 added elastic stiffness matrix as crystallite output 2012-03-01 13:06:09 +00:00
Christoph Kords 8dc6e256c0 choose textures and phases of example materials according to what the labels suggest 2012-02-21 13:16:59 +00:00
Christoph Kords 5ddade27fc changed Peierls stress to more realistic values for fcc 2012-02-03 13:12:45 +00:00
Christoph Kords d62eddc0cd corrected kinetics law and changed parameters. For solid solution hardening there are 3 parameters: the activation energy, the concentration of obstacles that determines the activation length and meanfreepath, and the obstacle size that determines the activation volume. For the Peierls mechanism there is: the width of doublekinks that determines the activation volume and the Peierls stress for edge and screw.
Still testing needed to check whether the current formulation makes sense or not.
2012-02-03 12:50:54 +00:00
Christoph Kords df931890e0 corrected typos 2012-01-26 12:50:04 +00:00
Christoph Kords 5a658d1b82 dislocation velocity output for each dislocation type (edge+,edge-,screw+,screw-)
for fcc constitutive_nonlocal_kinetics is called only once and the result is used for each dislocation type, for all other lattice structures we have one call for each dislocation type
2012-01-26 07:43:36 +00:00
Christoph Kords e5407894b5 Reworked kinetics. Now there is a universal law which can be used for both fcc and bcc (and probably even hcp). It mainly consists of an athermal forest cutting part , solid solution and peierls as thermally activated processes, and viscous glide. Therefore, lots of new parameters in the material.config. Not sure yet if the values make sense though.
Also renamed some of the old parameters. 

Unknown constitutive output raises error.
2012-01-25 17:04:37 +00:00
Christoph Kords 4980f57fd5 added total Green-Lagrange strain to crystallite outputs 2012-01-20 10:25:35 +00:00
Christoph Kords 8739b9522e dislocation stress does not add to stress field anymore, but is only available as constitutive output for purposes of postprocessing. instead, we now use a backstress term (which is added to the resolved shear stress) that depends on the gradient of excess density on the same slip system. 2012-01-17 10:26:57 +00:00
Franz Roters 515986c4d6 renamed w0 and w0_slip to a and a_slip 2011-11-23 14:48:39 +00:00
Christoph Kords 7033e84fc7 new outputs "accumulatedshear", "velocity_edge", and "velocity_screw" (the latter two replace the output "dislocationvelocity") 2011-11-09 09:22:52 +00:00
Franz Roters 58917b5abe corrected error messages
you can now switch of shear banding by seting sb_velocity to zero
stacking fault energy parameters are now read from material.config
2011-09-26 09:55:08 +00:00
Franz Roters 9d091bdc3f added parameters for shear band model 2011-09-14 13:35:28 +00:00
Christoph Kords 9a64f3dd85 * comments are now recognized by IO even when they do not appear at the beginning of the line
* no need for the zero entries in the material.config anymore
2011-05-30 09:09:19 +00:00
Christoph Kords bbf75f3fb5 cannot omit entries for second to fourth slip system family, though they are zero 2011-05-30 07:53:41 +00:00
Franz Roters 08d39342e4 reworked restarting for compatibility with abaqus (not yet fully working)
added new orientation feature for direct simulation:
  component type (random) asigns random orientation to an entire grain
2011-05-28 09:44:43 +00:00
Christoph Kords a910c469df update of nonlocal material parameters 2011-05-20 08:11:22 +00:00
Philip Eisenlohr 1baae024cb added two more <crystallite> examples 2011-05-13 16:54:08 +00:00
Philip Eisenlohr e5a2d829b0 new substructure with 'include' and 'config' directories
renaming of mpie_... to DAMASK for main usersubroutines

extension of element outputs from 5 to 8 digits (FFT!!!)
2011-05-11 16:38:45 +00:00