Differences

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--- doc:user:general:ifields [2014/10/20 12:06] – papeleux
+++ doc:user:general:ifields [2016/10/09 12:20] – canales
@@ Line 1: / Line 1: @@
-====== Internal Fields ======
+====== Fields at Gauss Points ======
-Fields that are saved for each integration point are referenced by codes with the ''IF'' prefix (standing for **I**nternal **F**ield).
+Fields that are computed at each integration point are referenced by codes with the ''IF'' prefix (standing for **I**nternal **F**ield).
-^  Metafor Code ^  Description  ^
+^  Metafor Code  ^  Description  ^
 | ''IF_DEV_SIG_XX'' | Cauchy stress deviator tensor (see important remark at the bottom) |
 | ''IF_DEV_SIG_YY'' |  :::|
@@ Line 23: / Line 23: @@
 | ''IF_SIG_ORTHO_XZ'' |:::  |
 | ''IF_SIG_ORTHO_YZ'' |:::  |
-| ''IF_ALP_XX'' | "backstress" |
+| ''IF_ALP_XX'' | "backstress" (kinematic hardening) |
 | ''IF_ALP_YY'' |  :::|
 | ''IF_ALP_ZZ'' |  :::|
@@ Line 53: / Line 53: @@
 | ''IF_EVMS'' | von Mises stress |
 | ''IF_TRIAX'' | stress triaxiality T = hydrostatic stress / equivalent stress |
-| ''IF_RUPT_CRIT'' | Rupture Criterion |
+| ''IF_RUPT_CRIT'' | rupture Criterion |
 | ''IF_DYNAMIC_YIELD'' | dynamic yield stress|
 | ''IF_STATIC_YIELD'' | static yield stress |
@@ Line 71: / Line 71: @@
 | ''IF_GRADT_Y'' |  :::|
 | ''IF_GRADT_Z''  |  :::|
-| ''IF_DEV_SIG_XX_UPPER_SIDE'' | stress deviator tensor - upper skin of a shell |
+| ''IF_DEV_SIG_XX_UPPER_SIDE'' | stress deviator tensor - upper skin of a shell{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
 | ''IF_DEV_SIG_YY_UPPER_SIDE'' |  :::|
 | ''IF_DEV_SIG_ZZ_UPPER_SIDE'' |  :::|
-| ''IF_SIG_XX_UPPER_SIDE'' | stress tensor - upper skin of a shell |
+| ''IF_SIG_XX_UPPER_SIDE'' | stress tensor - upper skin of a shell{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
 | ''IF_SIG_YY_UPPER_SIDE'' |  :::|
 | ''IF_SIG_ZZ_UPPER_SIDE'' |  :::|
@@ Line 80: / Line 80: @@
 | ''IF_SIG_XZ_UPPER_SIDE'' |  :::|
 | ''IF_SIG_YZ_UPPER_SIDE'' |  :::|
-| ''IF_P_UPPER_SIDE'' | pressure - upper skin of a shell |
+| ''IF_P_UPPER_SIDE'' | pressure - upper skin of a shell{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
-| ''IF_EPL_UPPER_SIDE'' | equivalent plastic strain - upper skin of a shell |
+| ''IF_EPL_UPPER_SIDE'' | equivalent plastic strain - upper skin of a shell{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
-| ''IF_DEV_SIG_XX_LOWER_SIDE'' | stress deviator tensor - lower skin of a shell  |
+| ''IF_DEV_SIG_XX_LOWER_SIDE'' | stress deviator tensor - lower skin of a shell{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}}  |
 | ''IF_DEV_SIG_YY_LOWER_SIDE'' |  :::|
 | ''IF_DEV_SIG_ZZ_LOWER_SIDE'' |  :::|
-| ''IF_SIG_XX_LOWER_SIDE'' | stress tensor - lower skin of a shell |
+| ''IF_SIG_XX_LOWER_SIDE'' | stress tensor - lower skin of a shell{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
 | ''IF_SIG_YY_LOWER_SIDE'' |  :::|
 | ''IF_SIG_ZZ_LOWER_SIDE'' |  :::|
@@ Line 91: / Line 91: @@
 | ''IF_SIG_XZ_LOWER_SIDE'' |  :::|
 | ''IF_SIG_YZ_LOWER_SIDE'' |  :::|
-| ''IF_P_LOWER_SIDE'' | pressure - lower skin of a shell |
+| ''IF_P_LOWER_SIDE'' | pressure - lower skin of a shell{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
-| ''IF_EPL_LOWER_SIDE'' | equivalent plastic strain - lower skin of a shell |
+| ''IF_EPL_LOWER_SIDE'' | equivalent plastic strain - lower skin of a shell{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
-| ''IF_THICKNESS'' | deformed thickness of a shell |
+| ''IF_THICKNESS'' | deformed thickness of a shell{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
-| ''IF_CURVATURE_XX'' | shell curvatures |
+| ''IF_CURVATURE_XX'' | shell curvatures{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
 | ''IF_CURVATURE_YY'' |  :::|
 | ''IF_CURVATURE_ZZ'' |  :::|
@@ Line 100: / Line 100: @@
 | ''IF_CURVATURE_XZ'' |  :::|
 | ''IF_CURVATURE_YZ'' |  :::|
-| ''IF_TORQUE_XX'' | shell torques |
+| ''IF_TORQUE_XX'' | shell torques{{:doc:user:ico-expert.png?18|Expert!}}{{:doc:user:ico-danger.png?18|Danger!}} |
 | ''IF_TORQUE_YY'' |  :::|
 | ''IF_TORQUE_ZZ'' |  :::|
@@ Line 115: / Line 115: @@
 | ''IF_FTOTAL_ZX'' |  :::|
 | ''IF_FTOTAL_ZY'' |  :::|
+| ''IF_LODE_PARAMETER'' | Lode parameter $\in [-1,1]$ |
 This codes are to be used in [[doc:user:results:courbes_res]] to specify which field must be archived.
-Important note: IF_SIG_XX stresses are always Cauchy stresses, whether a [[doc:user:elements:volumes:iso_hypo_materials#evpisohhypomaterial|hypoelastic]] or [[doc:user:elements:volumes:hyper_materials#neohookeanhyperpk2material|hyperelastic]] formulation is used. To get Piola-Kirchhoff number 2 stresses, the transformation formula must be applied, used the gradient deformation tensor (IF_FTOTAL_XX, ...):
+Important note: ''IF_SIG_XX'' stresses are always Cauchy stresses, whether a [[doc:user:elements:volumes:iso_hypo_materials#evpisohhypomaterial|hypoelastic]] or [[doc:user:elements:volumes:hyper_materials#neohookeanhyperpk2material|hyperelastic]] formulation is used. To get Piola-Kirchhoff-2 stresses, the transformation formula must be applied, used the gradient deformation tensor (''IF_FTOTAL_XX'', ...):
 $$
- \boldsymbol{\sigma}_{cauchy} = \dfrac{\boldsymbol{F}\,\boldsymbol{\sigma}_{PK2}\,\boldsymbol{F}^T}{det(F_{total})}
+ \boldsymbol{\sigma}_{\text{cauchy}} = \dfrac{\mathbf{F}\,\boldsymbol{\sigma}_{\text{PK2}}\,\mathbf{F}^T}{\det(\mathbf{F}_{\text{total}})}
 $$