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PSHELLX |
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PSHELLX |
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»Click here to display Table of Contents«
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PSHELLX |
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PSHELLX |
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Bulk Data Entry
PSHELLX – Optional SHELL Property Extension for Geometric Nonlinear Analysis
Description
Defines additional SHELL properties for geometric nonlinear analysis.
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
PSHELLX |
PID |
ISHELL |
ISH3N |
ISMSTR |
NIP |
HM |
HF |
HR |
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DM |
DN |
ITHICK |
IPLAS |
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Field |
Contents |
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PID |
Property ID of the associated PSHELL. See comment 1. No default (Integer > 0) |
ISHELL |
CQUAD4 element formulation flag. Default as defined by XSHLPRM (Integer) = 1 - Q4, visco-elastic hourglass modes orthogonal to deformation and rigid modes (Belytschko). = 2 - Q4, visco-elastic hourglass without orthogonality (Hallquist). Is incompatible with NIP = 1. = 3 - Q4, elastic-plastic hourglass with orthogonality. = 4 - Q4 with improved type 1 formulation (orthogonalization for warped elements). = 12 - QBAT or DKT18 shell formulation. = 24 - QEPH shell formulation. |
ISH3N |
CTRIA3 element formulation flag. Default as defined by XSHLPRM (Integer) = 1 - Standard triangle (C0). = 2 - Standard triangle (C0) with modification for large rotation. = 30 - DKT18. = 31 - DKT_S3. |
ISMSTR |
Shell small strain formulation flag. Default as defined by XSHLPRM (Integer) 1 - Small strain from time = 0. 2 - Full geometric non-linearity with optional small strain formulation activation by time step XSTEP, TYPEi = SHELL, TSCi = CST. 3 - Alternative small strain formulation from time = 0 (ISHELL =2 only). 4 - Full geometric non-linearity (Time step limit has no effect). |
NIP |
Number of integration points through the thickness. = 0, defines global integration is only compatible with MAT1, MATS1, MATX2, and MATX36. =1, membrane only behavior happens for MAT1; otherwise, NIP is ignored and NIP = 0 is used. Default as defined by XSHLPRM (0 < Integer < 10) |
HM |
Shell membrane hourglass coefficient (ISHELL = 1, 2, 3, and 4 only). Default = 0.01 (Real, 0.0 < HM < 0.05) Except ISHELL = 3: Default = 0.1 (Real) |
HF |
Shell out of plane hourglass coefficient (ISHELL = 1, 2, 3, and 4 only). Default = 0.01 (0.0 < Real < 0.05) |
HR |
Shell rotation hourglass coefficient (ISHELL = 1, 2, 3, and 4 only). Default = 0.01 (0.0 < Real < 0.05) Except ISHELL = 3: Default = 0.1 (Real) |
DM |
Shell membrane damping (with MATX27 and MATX36 only). Default: See comment 7 (Real) |
DN |
Shell numerical damping (ISHELL = 12, 24, ISH3N = 30 only). Default: See comment 8 (Real) |
ITHICK |
Shell resultant stresses calculation flag. Default as defined by XSHLPRM (CONST or VAR) CONST - Thickness is constant. VAR - Thickness change is taken into account. The small strain option is automatically deactivated. It is recommended to use IPLAS = NEWT. |
IPLAS |
Shell plane stress plasticity flag (with MATX2, MATX27, and MATX36 only). Default as defined by XSHLPRM (RAD or NEWT) RAD - Radial return. NEWT - Iterative projection with 3 Newton iterations. The small strain option is automatically deactivated. |
| 1. | The property identification number must be that of an existing PSHELL bulk data entry. Only one PSHELLX property extension can be associated with a particular PSHELL. |
| 2. | PSHELLX is only applied in geometric nonlinear analysis subcases which are defined by ANALYSIS = EXPDYN. It is ignored for all other subcases. |
| 3. | Q4: Original 4 node OptiStruct shell with hourglass perturbation stabilization. |
QEPH: Formulation with physical hourglass stabilization for general use.
QBAT: Modified BATOZ Q4g 24 shell with 4 Gauss integration points and reduced integration for in-plane shear. No hourglass control is needed for this shell.
DKT18: BATOZ DKT18 thin shell with 3 Hammer integration points.
| 4. | If the small strain option (ISMSTR) is set to 1 or 3, engineering strain and stress are used; otherwise they are true strain and stress. |
| 5. | For MATX2, the default value for IPLAS and global integration (NIP=0) is IPLAS = RAD. |
| 6. | For MATS1, MATX36 the default value for IPLAS and global integration (NIP=0) is IPLAS = NEWT. |
| 7. | Defaults for DM: |
Material |
Element type |
ISHELL/ISH3N |
Default |
|---|---|---|---|
MATX27 |
except QEPH, QBAT |
except 12, 24 |
5% |
QEPH |
24 |
1.5% |
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QBAT |
12 |
0% |
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MATX36 |
except QEPH |
except 24 |
0% |
QEPH |
24 |
1.5% |
| 8. | Defaults for DN: |
Element type |
ISHELL/ISH3N |
Default |
Usage |
|---|---|---|---|
QBAT |
12 |
0.1% |
All stress terms, except transverse shear. |
QEPH |
24 |
1.5% |
Hourglass stress. |
DKT18 |
12/30 |
0.01% |
Membrane stress only. |
| 9. | This card is represented as an extension to a PSHELL property in HyperMesh. |
See Also:
