c19524f264
1) fixed terminallyIll bug occurring with Ngrains=1 homogenization
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2) brushed up the output to be more easily readable/understandable
2010-09-01 21:04:02 +00:00
4f29e8c2fe
Introduced twinning. Twinning based on accumulated shear on twin systems. No slip-twin interactions yet.
2010-09-01 10:07:52 +00:00
a5c228fd02
changed back transform to complex-to-real, removed redundant variables, reduced size of arrays where possible
2010-09-01 08:05:11 +00:00
85febf0803
added fftw3 as fft(library will not versioned, should be in a linkable folder) , did some corrections on the code, splitted main file up (allows use of makefile), added makefile
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changes on mpie_spectral.f90:
new structure, changed variable names, now using defgrad instead of disgrad, cleaned up, removed augmented Lagrange.
ToDo: Implement Augmented Lagrange again (but then a working version), implement Large strain, think about complex-to real-transform backwards, try to implement MP-support
2010-08-27 16:39:38 +00:00
05568ef73b
calculation of state damper was erroneous for use with nonlocal and other constitution at the same time
2010-08-26 12:54:31 +00:00
197d7ea8d9
rearranged output statements in crystallite init for better readability in output file
2010-08-26 09:52:40 +00:00
ec4269bdd8
Added 'dislocation-type' dependent interactions. Ideal for hexagonal and BCC structures.
2010-08-23 11:36:51 +00:00
da53656c9a
added C3D20R (type 9) to list of possible non-local elements (Christoph, should we invent a reasonable error number for this? "-1" may not be optimal...)
2010-08-19 23:00:26 +00:00
c352146fe6
exchanged forall (warning causers) to nested do loops
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deleted (currently unused) symmetrization of H tensor in CPFEM.f90 --> Denny pls advise?
2010-08-19 21:35:38 +00:00
f78b07448f
some modifications in line with Davids analytical model
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input some additional variables via material.config
2010-08-17 14:23:55 +00:00
bb9899e7de
1) added element type 57 (C3D20R) reduced quadratic hexahedral
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2) need discussion about the present omission of the FE_nodesAtIP for type 8 --> added comment into source code
2010-08-16 22:53:24 +00:00
9f071c3e01
Added kink-pair pre-factor for screw dislocation mobilities on non-basal slip systems in hex
2010-08-06 15:53:45 +00:00
298cecbfec
corrected syntax errors (long lines, line continuation by \) and logical mistake in mpie_cpfem_marc / abq_std which went unnoticed in ifort. Using SunStudio f90 surfaced those...
2010-08-03 23:47:00 +00:00
60decea760
Calibration (Prismatic slip) of the new dislocation density based CPFE model for single crystal alpha-Ti (Titanmod). Formulated edge and screw dislocations mobilities in presence of kink pairs. Updated comments. The model shows the plateau in stress evolution in prismatic orientation which is observed in experiments.
2010-07-15 07:16:15 +00:00
49926d5d66
F77 --> F90 polishing/condensation as far as possible.
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next step is change of Re/Im FFT to Re only...
2010-07-13 15:29:26 +00:00
4d110126da
adopted improvements done by Arun Prakash.
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mesh:
elemType identification based on lower case
Abaqus now reports more errors
IO:
new function to inquire whether inputfile contains "parts"
new function to assemble multiply included inputfile into a flat one
awareness of range generation in element numbers
error reporting
2010-07-13 10:26:07 +00:00
eb7830dc8f
New Titanium CPFE model based on dislocation density. Running but calibration and changes needed.
2010-07-13 08:19:25 +00:00
397db06fb3
cpfe_general now returns also Kirchhoff-stress P and dPdF
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added dummy variables P and dPdF to mpie_cpfe_* to be able to call cpfem_general correctly
2010-07-07 09:58:18 +00:00
80016f8429
added P and dPdF for the call to cpfem_general, made some comments in the code, aligned some loops
2010-07-07 09:10:54 +00:00
f9834bc612
changed types of integers and reals in fourier transform, changed some variables and cleaned up code to make it easier to understand
2010-07-05 16:01:36 +00:00
c3e222dbbd
errs added etc.
2010-07-05 11:33:48 +00:00
4f76eada31
started suggestions for F77 --> F90 style
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xkdyad useful..?
looking for error calculation (Ricardo to rescue here)
2010-07-02 17:15:53 +00:00
d6ba9d54b6
changed declaration of two variables from real to int, spectral method is now working.
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started to commend Ricardos code, layoutet loops and removed some redundant variables.
until now, no error calculation is done. at the moment calculations are in an infinite loop
2010-07-02 14:10:36 +00:00
661bb97800
corrected some problems in building mesh
2010-07-01 15:20:39 +00:00
2ec39c936c
added first version of spectral method, changed corrected functions to get correct path to files
2010-07-01 15:20:06 +00:00
c3e51e5330
added functions to read out resolution, dimension and homogenization from mesh file
2010-06-25 11:31:05 +00:00
eb0cc24a8e
no need for material parameter "a" anymore, dislocation stress calculation now works without "core spreading"
2010-06-21 16:01:05 +00:00
7d6e52067b
dislocation stress based on dislocation density gradients
2010-06-21 15:58:56 +00:00
6d874e2c1f
nonlocal stiffness calculation:
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rather perturb all components at once (and optionally decrease the frequency of the Jacobian update with the iJaco parameter) than perturbing only a single component per cycle
2010-06-17 06:32:56 +00:00
1c72439350
first shot at init with CPFEM_general
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better would be to manually read the mesh resolution, set up Spectral solution strategy and call CPFEM_general just during BVP solution.
2010-06-10 15:32:06 +00:00
8ea52ac495
mpie_spectral now can read loadcase data
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adapted error codes
2010-06-10 14:51:10 +00:00
386ca7ebc3
added some basic I/O functions to mpie_spectral.f90
2010-06-10 08:50:04 +00:00
740db98090
- use upwind differences scheme for fluxes instead of central differences
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- introduced possibility to "reflect" fluxes at free surfaces in order to have quasi-periodic fluxes
2010-06-09 08:56:00 +00:00
11b98fbfa6
added ID functionality and correct line endings
2010-06-08 10:10:57 +00:00
82687d31c8
first shot at mpie_spectral wrapper
2010-06-08 10:08:15 +00:00
7e78932976
renamed "mpie_cpfem_init" subroutine within mpie_interface module to more general name "mpie_interface_init"
2010-06-08 09:35:13 +00:00
71c6179ee5
dislocation stress had wrong sign in some components
2010-06-08 09:34:23 +00:00
3ce1882d29
when calculating dislocation stress at grain boundaries, densities are now extrapolated similarly to like it was already done at free surfaces
2010-06-07 16:01:37 +00:00
3989cc2688
dislocation stress now considers dislocation segments of length V^(1/3) and ensures non-singular solution for points that are collinear to the dislocation line by means of a core spreading parameter "a". stress is scaled by a reference cutoff radius "r" to avoid mesh-dependent stress values.
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corrected formula for conversion of anisotropic elastic constants to isotropic Youngs modulus and poissons ratio
2010-06-07 14:32:23 +00:00
5283ba5546
if it is pReal it should be 1.0 not just 1
2010-05-31 07:12:45 +00:00
76b392e12f
dislocation stress calculation in constitutive_nonlocal_microstructure: corrected mapping from lattice to slip system frame and the neighboring dislocation density formulation
2010-05-28 13:12:36 +00:00
bb73a74325
there was a line break missing so that it did not compile
2010-05-26 17:10:26 +00:00
9932c90c73
restoring the crystallite.f90, IO.f90 and material.f90 to the version 575. the version 576 of these files contain some uncleared debugging statements.
2010-05-26 16:34:44 +00:00
d114a600c3
fixed some errors in QuaternionToEuler, RToQuaternion to get the correct texture representation in the output.
2010-05-26 15:52:54 +00:00
e5f0af638e
fixed calculation of dislocation stress for elements with a single ip and no neighbors; used to get segmentation fault
2010-05-26 09:17:10 +00:00
0c5bc83469
in nonlocal_microstructure: at the model surface the excess density is now extrapolated from opposite neighbor instead of assuming zero density; this results in better modeling of the dislocation stress at the surface
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restructured nonlocal_dotstate, to be able to easily switch on and off particular effects in the microstructure evolution
nonlocal_dotstate now enforces a cutback when single density runs the risk of becoming negative; in the case of a state already below the relevantState dotState is set to zero
introduced two new output variables: rho_dot_edge and rho_dot_screw
2010-05-21 08:51:15 +00:00
dba4ae7ef1
new numerics parameter "defgradTolerance" replaces "relevantStrain" in cpfem, since "relevantStrain" is also used in crystallite but in a different context.
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"defgradTolerance" gets the same standard value as "relevantStrain" so calculations should be consistent with older ones
2010-05-20 14:55:11 +00:00
3a23dc4bbd
first call to hypela2 in inc 0 is done with computation mode 2 (=plain calc), but since rev. 539 the second call was done with computation mode 6 (=only return values) instead of 2. This doesnt work, because computation mode 2 might calculate stress and tangent for all materialpoints, but the mapping from lattice to current configuration is only done for the element/IP that triggers the call.
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So switched back to the former order of calls which also works for marc2010:
el 1 IP 1 | el 1 IP 2
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inc mode lovl | inc mode lovl
------------------ | ------------------
0 2 6 | 0 2 6
1 6 4 | 1 6 4
1 4 6 | 1 3 6
1 6 4 | 1 6 4
1 1 6 | 1 2 6
Still to be checked:
according to Franz the lovl order could be different in contact analysis (e.g. starting with lovl 4 instead of 6)
2010-05-20 09:14:59 +00:00
51da3b6242
sorry, in rev 568 some variables were not declared in crystallite_postResults
2010-05-18 12:36:09 +00:00
472684c30e
make element type 8 (= hex8 reduced integration) available for nonlocal constitutive law
2010-05-18 08:13:23 +00:00
Philip Eisenlohr