Users:General FEM Analysis/Elements Reference/Shell9
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* NONE: ANS is not activated | * NONE: ANS is not activated | ||
* Q: ANS against shear locking is activated. It works for 4-noded and 9-noded elements. It causes a constant-linear (linear-quadratic, respectively) interpolation of the transverse shear strains and thus avoids transverse shear locking. The approach for the 4-noded element represents the well-known Bathe-Dvorkin-Element (MITC-4). | * Q: ANS against shear locking is activated. It works for 4-noded and 9-noded elements. It causes a constant-linear (linear-quadratic, respectively) interpolation of the transverse shear strains and thus avoids transverse shear locking. The approach for the 4-noded element represents the well-known Bathe-Dvorkin-Element (MITC-4). | ||
| − | * T: ANS against curvature thickness locking | + | * T: ANS against curvature thickness locking |
|- | |- | ||
!EAS | !EAS | ||
| Line 38: | Line 38: | ||
!FORCE | !FORCE | ||
|XYZ, RST_ORTHO, RST | |XYZ, RST_ORTHO, RST | ||
| − | |Output control for stress constraints | + | |Output control for stress constraints |
* XYZ: | * XYZ: | ||
* RST_ORTHO: | * RST_ORTHO: | ||
| Line 78: | Line 78: | ||
<pre> | <pre> | ||
EL-PROP 1: SHELL9 | EL-PROP 1: SHELL9 | ||
| − | MAT=EL-MAT | + | MAT=EL-MAT 1 |
THICKNESS = 0.1 | THICKNESS = 0.1 | ||
INT_TYPE_SHELL9 = FULL | INT_TYPE_SHELL9 = FULL | ||
SDC = 1.0 | SDC = 1.0 | ||
| − | EAS = | + | EAS = 4,4,4,4,4 |
ANS = NONE | ANS = NONE | ||
FORCE = XYZ | FORCE = XYZ | ||
| Line 91: | Line 91: | ||
STRESS_EVAL = SURF | STRESS_EVAL = SURF | ||
</pre> | </pre> | ||
| + | |||
| + | == Benchmarks == | ||
| + | |||
| + | The main benchmark files in the ''Carat++''-repository are | ||
| + | |||
| + | '../examples/benchmark_examples/elements/shell9_4_temperature_nln/cbm_SHELL_4NODED.dat' | ||
| + | |||
| + | '../examples/benchmark_examples/elements/shell9_8_temperature_nln/cbm_SHELL_8NODED.dat' | ||
| + | |||
| + | == Known issues == | ||
| + | |||
| + | Eigenvalue analysis with DIR_DIFF gives wrong results (AE, SSH;2017) | ||
Latest revision as of 12:16, 12 April 2017
The element formulation is based on the Shell8.
Contents |
Input Parameters
Parameter Description
| Compulsory Parameters | ||
| Parameter | Values, Default(*) | Description |
|---|---|---|
| MAT | EL-MAT int | Linking to a material input block |
| INT_TYPE_SHELL9 | FULL | Control of integration type |
| ANS | NONE, Q, T, QT, TQ | Assumed Natural Strains (ANS) method:
|
| EAS | M,B,T,Q,S | Enhances Assumed Strains (EAS) method
|
| FORCE | XYZ, RST_ORTHO, RST | Output control for stress constraints
|
| SDC | real | condition factor for director length, recommended value: 1.0 |
| ROTATORIC_DOFS | DIR_DIFF, GLOB_6 | Switch between director and rotational degrees of freedom. |
| STRESS_OUTPUT | PRIN_VM, SIG_EPS | Stress output type
|
| STRESS_EVAL | GP, SURF | Stress evaluation location.
|
| Optional Parameters | ||
| Parameter | Values, Default(*) | Description |
| THICKNESS | real | Element thickness. This parameter is not compulsory, as the thickness can also be described via nodal values. |
Example of a Complete Input Block
EL-PROP 1: SHELL9 MAT=EL-MAT 1 THICKNESS = 0.1 INT_TYPE_SHELL9 = FULL SDC = 1.0 EAS = 4,4,4,4,4 ANS = NONE FORCE = XYZ MATERIAL_ANGLE = 0 ROTATORIC_DOFS = DIR_DIFF STRESS_OUTPUT = PRIN_VM STRESS_EVAL = SURF
Benchmarks
The main benchmark files in the Carat++-repository are
'../examples/benchmark_examples/elements/shell9_4_temperature_nln/cbm_SHELL_4NODED.dat'
'../examples/benchmark_examples/elements/shell9_8_temperature_nln/cbm_SHELL_8NODED.dat'
Known issues
Eigenvalue analysis with DIR_DIFF gives wrong results (AE, SSH;2017)
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