Commit Graph

6167 Commits

Author SHA1 Message Date
Christoph Kords f4e5d32cde added flag verboseDebugger to debug in order to have more control about debugging statements
set this to true if you want extended debugging info in the output file
2010-03-19 14:14:08 +00:00
Claudio Zambaldi 418bb9ecbe small improvement in readability 2010-03-19 12:56:00 +00:00
Christoph Kords 948c119ee9 changed internal representation of orientation and misorientation from euler angles to quaternions (this should also fix some bugs in the math_misorientation subroutine). includes a couple of new functions in math.f90 and some changes in crystallite.f90.
beware that crystallite output "orientation" now by default returns the orientation as quaternion. if you want euler angles instead, you have to add "eulerangles"  as a crystallite output in your material.config file (see material.config template).

for input of orientations in the texture block of the material.config you still have to specify the rotation in terms of euler angles, quaternions are not yet supported for input.
2010-03-18 12:23:17 +00:00
Christoph Kords e6fdfdfc36 iJacoStiffness belongs to numerics, not debug
sorry for not having checked that before
2010-03-17 17:00:54 +00:00
Christoph Kords 1a992e1aef nonlocal stiffness calculation produced segmentation fault for cycle number > 16. Corrected calculation of perturbation indices k and l. 2010-03-10 09:53:41 +00:00
Christoph Kords e3dd7551dc added output for dislocation evolution rate associated with flux: "rho_dot_flux" 2010-03-10 09:49:40 +00:00
Philip Eisenlohr 4752bbe42e deleted unused <global> part from file 2010-03-09 15:36:07 +00:00
Christoph Kords 61bd0224c1 - corrected an if statement in the state loop
- nonlocal stiffness calculation: we perturb all material points at the same time, so instead of N^2 loops we just need N
- set "forceLocalStiffnessCalculation" to false as standard
2010-03-04 17:27:39 +00:00
Christoph Kords a0d28ebc18 - flux calculation is now also compatible to neighborhood of local constitution
- flux density interpolation now depends on the position of the interface between ttwo neighboring material points
- simplified flux calculation scheme
- introduced sanity check for dislocation velocity to ensure v*dt< cellsize
2010-03-04 17:14:47 +00:00
Christoph Kords 947af80a2e removed old debugging statements 2010-02-26 12:02:49 +00:00
Philip Eisenlohr 8c8ed34356 reworked crystallite part to allow for flexible user output
--> new "crystallite" part in config file
--> new "crystallite" option for microstructures
--> new output file "...job.outputCrystallite" to be used in conjunction with marc_addUserOutput for meaningful naming of User Defined Vars.
2010-02-25 17:39:11 +00:00
Christoph Kords 538faecf45 new output "dislocationvelocity" 2010-02-23 17:23:07 +00:00
Christoph Kords c1717329ac only need 2 logicals in crystallite_stressAndItsTangent to reflect all possible integration states, so crystallite_onTrack was obsolete and replaced by crystallite_todo; broken state update now directly produces a cutback 2010-02-23 09:46:39 +00:00
Claudio Zambaldi 7526a24a1b now with functionality to output a "JOB.outputHomogenization". This contains size descriptions of all requested output variables to be parsed by a further script to generate meaningful names for user defined vars... (watch out!) 2010-02-19 18:03:16 +00:00
Christoph Kords aab5598d96 detabbed file for better readability 2010-02-19 13:44:38 +00:00
Philip Eisenlohr 8c5852dedf corrected messed up output of grain orientation in t16-file.
this bug affected at least all calculations done after revision 480 (Dec 18, 2009)
2010-02-18 16:09:45 +00:00
Denny Tjahjanto e9aac0c4af (1) change phaseOfGrain from real to integer and (2) introducing a condition to switch off the grain reshuffling when element homogeneous is requested. 2010-02-18 15:54:10 +00:00
Claudio Zambaldi d60d8a4103 small readability improvement 2010-02-18 15:06:08 +00:00
Franz Roters 7e632e8132 corrcected definition of forceLocalStiffnessCalculation 2010-02-18 14:43:40 +00:00
Philip Eisenlohr e1a25e0f73 renaming of abaqus to _std and adding of VUMAT interface for explicit. 2010-02-18 10:23:42 +00:00
Philip Eisenlohr af06e8e58f fixed some dangerous constructs in computation mode assignments
introduction of separate stress and stiffness variables to pass on to CPFEM_general (of dimension 6)
2010-02-18 10:23:02 +00:00
Philip Eisenlohr 78808a7d47 corrected corrupted header $id 2010-02-18 10:18:15 +00:00
Philip Eisenlohr 4cb7254a21 added new computation modes 8 and 9 for Abaqus_exp. These correspond to mode 1 and 2 but do collection and calculation in one step.
stress and stiffness are always of dimension 6 in CPFEM_general, hence, variable "ngens" useless by now
2010-02-18 10:15:08 +00:00
Philip Eisenlohr c3cd75c2c2 small polishing 2010-02-18 10:12:45 +00:00
Franz Roters 9c63005c8f allow for longer pathes when openening files
corrected error messages concerning file openening
2010-02-18 08:29:57 +00:00
Christoph Kords 97db70cf23 constitutive_nonlocal:
- reworked contribution of immobile dislocation density for rate equations
- flux is now calculated on the basis of interpolated velocities and densities at the interface; both incoming and outgoing fluxes are considered, so every material point only changes his own dotState
- dislocation velocity is now globally defined and calculated by subroutine constitutive_nonlocal_kinetics; the subroutine is called inside _LpAndItsTangent as well as _microstructure; therefore, microstructure now needs Tstar_v as additional input; in the future one should perhaps create a subroutine constitutive_kinetics that calls constitutive_nonlocal_kinetics separately, to clearly distinguish between microstructural and kinetic variables 
- better use flux density vector as output variable instead of scalar flux values for each interface
- added output variables internal and external resolved stress

crystallite:
- added flag to force local stiffness calculation in case of nonlocal model
- misorientation angle is explicitly set to zero when no neighbor can be found

debug:
- added flag "selectiveDebugger" that is used when debugging statements should only affect a specific element, ip and grain; these are specified with the new variables debug_e, debug_i and debug_g
- debugger can now be used in its original sense
2010-02-17 13:21:36 +00:00
Christoph Kords a2037db9c6 corrected sign of screw part of dislocation stress 2010-02-12 12:54:00 +00:00
Claudio Zambaldi f1daf9f2e7 added comment, my first 'test' SVN commit 2010-02-10 16:40:50 +00:00
Philip Eisenlohr f186c83068 introduced racing condition breaker for the case of multithreaded CPFEM init. 2010-02-02 15:00:08 +00:00
Franz Roters 101d4c6bb4 updated list 2010-02-02 13:05:17 +00:00
Franz Roters 02b98100d1 added / updated files for use with marc2010r1 2010-01-11 08:35:28 +00:00
Christoph Kords ed8446e0f3 - corrected contribution of immobile singles to dipole formation and annihilation rates
- remobilization of immobile singles immediately increases the mobile single dislocation density and therefore directly affects all other mechanisms in dotState
2010-01-06 09:54:00 +00:00
Christoph Kords dce840c0a5 - introduction of immobile (used) single dislocation densities as new state variables
- changed nomenclature (rho -> rhoSgl) to distinguish precisely between single dislocation density and total dislocation density
- changed material.config accordingly
2010-01-05 16:07:24 +00:00
Christoph Kords 2098c106ad misorientation is set to 400 degrees if our neighbor has a different phase 2010-01-05 16:03:45 +00:00
Christoph Kords aee0721ab2 corrected math_misorientation 2010-01-05 16:02:00 +00:00
Christoph Kords ac080e0b52 corrected small mistake in calculation for ip center of gravity / ip coordinates; used to ignore subnodes that had coordinates (0.0, 0.0, 0.0) 2009-12-22 13:23:20 +00:00
Denny Tjahjanto 043356e8a9 homogenization_RGC.f90 >> just switching-off one of the debugging statement.
crystallite.f90 >> optimizing the perturbation algorithm for local tangent.
2009-12-22 12:28:02 +00:00
Christoph Kords 1f7aebfa4d new subroutine crystallite_orientations: calculates the orientation matrix and the euler angles and - in case of single grain ips - the misorientation for each neighboring ip.
The calculation of the misorientation is now done once in crystallite init and at the end of every FE increment. This saves a lot of time compared to doing it in dotState for every crystallite subinc.
2009-12-18 15:46:33 +00:00
Denny Tjahjanto 3ab5cdc770 Additional feature to the RGC scheme: The volumetric consistency constraint. This is implemented by penalizing any volumetric discrepancy which occurs due to severe relaxation. The penalty for volume inconsistency is described using a power-law model. The setting for this function can be done in the numerics.config via three new parameters, i.e., maxvoldiscrepancy_RGC, voldiscrepancymod_RGC and discrepancypower_RGC. For monintoring, an extra output variable in prescribed in the material.config in the RGC section, namely "(output) volumediscrepancy".
IO.f90 and numerics.f90 has been modified accordingly to accommodate these changes
2009-12-16 16:20:53 +00:00
Franz Roters 39d1932e2b corrected line parsing now counts all parts 2009-12-15 16:03:53 +00:00
Christoph Kords 01b7e88e5f adapted the material.config file to last changes in constitutive_nonlocal 2009-12-15 10:22:17 +00:00
Christoph Kords 26e9056f90 added stiffness state loop counter to nonlocal stiffness calculation 2009-12-15 09:03:04 +00:00
Christoph Kords d784153e0c constitutive_nonlocal:
- corrected flux term
- multiplication is now aware of dislocation type
- corrected change rate for "dipole size" dupper
- corrected term for dipole dissociation by stress change
- added transmissivity term in fluxes which accounts for misorientation between two neighboring grains (yet hardcoded transmissivity according to misorientation angle)
- added more output variables

constitutive:
-  2 additional variables "previousDotState" and "previousDotState2", which are used to store the previous and second previous dotState (used in crystallite for acceleration/stabilization of state integration)
- timer for dotState now measures the time for calls to constitutive_ collectState (used to reside in crystallite_updateState, which is not critical in terms of calculation time anymore) 

crystallite:
- convergence check for nonlocal elments is now done at end of crystallite loop, not at the beginning; we simple set all elements to not converged if there is at least one nonlocal element that did not converge
- need call to microstructure before first call to collect dotState for dependent states
- stiffness calculation (jacobian): if there are nonlocal elements, we also have to consider changes in our neighborhood's states; so for every perturbed component in a single ip, we have to loop over all elements; since this is extremely time-consuming, we just perturb one component per cycle, starting with the one that changes the most during regular time step.
- updateState gets a damping prefactor for our dotState that helps to improve convergence; prefactor is calculated according to change of dotState

IO:
- additional warning message for unknown crystal symmetry
2009-12-15 08:20:31 +00:00
Christoph Kords 07303d9506 - corrected math_misorientation subroutine 2009-12-15 07:34:53 +00:00
Christoph Kords 596b7f3727 - rearranged array with symmetry operations
- new subroutine "math_misorientation" which calculates misorientations (based on old subroutine "misorientation", which was not used previously)
- rendered some functions pure
2009-12-14 11:02:10 +00:00
Philip Eisenlohr 6e1c731175 crystallite does not report volume fraction but real volume (i.e. sum of all volumes gives volume of your geometry) 2009-12-09 15:20:46 +00:00
Denny Tjahjanto cad278c3bc Introduce a randomness in the odd stress, using pre-factor rnd. 2009-12-09 10:33:00 +00:00
Luc Hantcherli d847f63e0d Added summary of the constitutive model for mechanical twinning as implemented in DisloTwin.f90 (both pdf and corresponding tex source) 2009-12-08 15:58:39 +00:00
Franz Roters 9b1b612f67 added some examples 2009-12-08 15:31:50 +00:00
Denny Tjahjanto 1bf3b978eb modifying the criteria for the sum of microstructure fraction.
previously was:
if (the_sum /= 1.0_pReal) then (error 170)
this condition is too strict. it may give problem with some numerical truncation error.

now becomes:
if (abs(the_sum - 1.0_pReal) >= 1.0e-10_pReal) then (error 170)
2009-12-02 13:08:14 +00:00