4a291dc372
implementation of twin nucleation criteria according to Davids PhD thesis
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applies for fcc crystal structure only
2013-07-01 13:06:01 +00:00
9a1ad7e089
added third value for slip twin interaction in fcc dislotwin example
2013-06-24 12:53:56 +00:00
ec2503253e
added output of slip direction and slip normal
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changed name of fluxdensity outputs
2013-05-23 08:19:36 +00:00
882c3e155f
Adding two titles for accumulated shear due to "slip" and "twin"
2013-05-19 20:34:40 +00:00
d2416abdb4
introduced new keyword 'rotation' to specify texture rotation
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ATTENTION: so far it is read but NOT yet applied!!!
waiting for updated code for orientation assignement
2013-05-02 08:35:37 +00:00
9b1fd579d4
corrected phase numbering in example material.config
2013-04-10 12:09:09 +00:00
10e50bf41d
improved accuracy of "accumulated shear": now added as a state variable, which facilitates integration (dotstate=shearrate); needs absolute tolerance value for state integration in material.config
2013-04-04 13:37:14 +00:00
44eb771583
added crystallite output of current ip coordinates
2013-03-27 10:12:28 +00:00
cee90bbdb3
simplified dislocation kinetics: dropped relativistic correction of velocity, since the infinite attack frequency already sets a limit for the velocity; dropped second; also dropped the correction term for backward jumps, since it was probably not meaningful
2013-03-21 12:52:29 +00:00
cd0325baf1
introduced atol_twinfrac for dislotwin
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set values in material.config example
atol_rho 1.0,
atol_twinFrac 1.0e-7
2013-02-14 09:57:26 +00:00
77c0b32af9
removed possible (but not-working) output of schmid_factor_shearband from dislotwin
2013-02-14 08:53:17 +00:00
c7740b41a5
added possible accumulated shear output request to example list of phenopowerlaw
2013-02-07 11:09:14 +00:00
fd94c786f0
moved stiffness tensor calculation to lattice
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introduced 'isotropic' and 'orthorhombic' lattice types to use corresponding symmetries in stiffness tensor. intended to be used with non-crystal plasticity models (j2, constitutive_none with isotropic, cubic or orthotropic elasticity).
2013-01-21 21:57:26 +00:00
8a45a90775
new crystallite output "grainrotationX", "grainrotationY", "grainrotationZ" that gives the deviation of the initial orientation in degrees around the sample reference x/y/z axis, while "grainrotation" still gives the same as axis angle pair in crystal coordinates
2013-01-16 08:45:41 +00:00
f14fd45ce1
new material parameter "egdejog": fraction of annihilated screw dipoles that forms edge jogs
2012-12-23 12:56:15 +00:00
9eb89b0050
made random multiplication switchable via material.config
2012-12-03 12:59:38 +00:00
62ddbf26df
slightly changed the multiplication term in the nonlocal model for the starvation case
2012-11-29 18:50:25 +00:00
f666f8dcf3
added possibility to scale the plastic shearrate by the ratio of mobile to total density; keyword in material.config is "deadZone"
2012-10-29 12:49:28 +00:00
3ecaa9e371
modified multiplication term in order to mimic a discrete distribution of dislocation sources; namely, at high resolution, when there is (on average) less than one source per integration point, a random generator decides whether there is a source in the finite volume or not; if there is one, then the multiplication turns independent of the density and depends only on the velocity/volume times a scalar factor; recovers density*velocity/lambda for large finite volumes
2012-10-19 11:40:17 +00:00
324dfda5a2
added comments (doxygen conform) to phenopowerlaw, added warning on specifying h0_sliptwin as it has no effect
2012-10-11 14:49:12 +00:00
40a2e652e7
introduced material parameter "linetension", which indicates how strong the effect of the line tension on the hardening coefficients is
2012-10-05 14:42:41 +00:00
1502a71f0c
added possibility to start with an initial random distribution of dislocation segments with specific overall density
2012-10-02 12:57:24 +00:00
9fc46b4950
added /echo/ statements
2012-10-02 08:12:53 +00:00
f153866030
introduced factor to control edge contribution to multiplication;
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dislocation density below a single dislocation per IP considered not significant
2012-09-04 16:56:37 +00:00
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.
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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
aa380dcb08
added separate output of dipole formation rate for edge and screw
2012-08-27 15:57:22 +00:00
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
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
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
823013d485
new plasticity: none
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see material.config for necessary parameters (lattice_structure, elastic constants)
2012-07-03 11:16:38 +00:00
bbf790a0a5
Input parameter 'QedgePerSbSystem' which denotes activation energy for each shear band system is added
2012-05-22 16:10:28 +00:00
9a92d343dc
added Onurs modified description for tausat in j2 law.
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Polishing phenopowerlaw
2012-04-11 14:01:02 +00:00
5263366615
adding switch in material.config for short range stress correction
2012-03-15 14:58:12 +00:00
503f6ed040
i think it's elasticity not elaticity, right?
2012-03-15 08:46:51 +00:00
36edb4dd9f
introduced keyword elasticity in material.config
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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
c9ed989dad
replaced keyword constitution with plasticity in preparation of upcomming generalized elasticity
2012-03-12 14:09:37 +00:00
211f66a728
added elastic stiffness matrix as crystallite output
2012-03-01 13:06:09 +00:00
8dc6e256c0
choose textures and phases of example materials according to what the labels suggest
2012-02-21 13:16:59 +00:00
5ddade27fc
changed Peierls stress to more realistic values for fcc
2012-02-03 13:12:45 +00:00
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.
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Still testing needed to check whether the current formulation makes sense or not.
2012-02-03 12:50:54 +00:00
df931890e0
corrected typos
2012-01-26 12:50:04 +00:00
5a658d1b82
dislocation velocity output for each dislocation type (edge+,edge-,screw+,screw-)
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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
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.
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Also renamed some of the old parameters.
Unknown constitutive output raises error.
2012-01-25 17:04:37 +00:00
4980f57fd5
added total Green-Lagrange strain to crystallite outputs
2012-01-20 10:25:35 +00:00
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
515986c4d6
renamed w0 and w0_slip to a and a_slip
2011-11-23 14:48:39 +00:00
7033e84fc7
new outputs "accumulatedshear", "velocity_edge", and "velocity_screw" (the latter two replace the output "dislocationvelocity")
2011-11-09 09:22:52 +00:00
58917b5abe
corrected error messages
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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
9d091bdc3f
added parameters for shear band model
2011-09-14 13:35:28 +00:00
9a64f3dd85
* comments are now recognized by IO even when they do not appear at the beginning of the line
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* no need for the zero entries in the material.config anymore
2011-05-30 09:09:19 +00:00
Franz Roters