PCOMPX

Bulk Data Entry Defines additional composite laminate properties for geometric nonlinear analysis.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PCOMPX PID ISHELL ISH3N ISMSTR   HM HF HR  
  DM DN ITHICK IPLAS          

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PCOMP 73                
  120 0.2 0.0 YES 120 0.6 45.0 YES  
PCOMPX 73 24              

Definitions

Field Contents SI Unit Example
PID Property ID of the associated PSHELL. 1

No default (Integer > 0)

  
ISHELL CQUAD4 element formulation flag.
1
Q4, visco-elastic hourglass modes orthogonal to deformation and rigid modes (Belytschko)
2
Q4, visco-elastic hourglass without orthogonality (Hallquist)
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

Default as defined by XSHLPRM (Integer)

  
ISH3N CTRIA3 element formulation flag.
1
Standard triangle (C0)
2
Standard triangle (C0) with modification for large rotation.
30
DKT18
31
DKT_S3

Default as defined by XSHLPRM (Integer)

  
ISMSTR Shell small strain formulation flag.
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).

Default as defined by XSHLPRM (Integer)

  
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 (Real, 0.0 ≤ HF ≤ 0.05)

  
HR Shell rotation hourglass coefficient (ISHELL = 1, 2, 3, and 4 only).

Default = 0.01 (Real, 0.0 ≤ HR ≤ 0.05)

Except ISHELL = 3: Default = 0.1 (Real)

  
DM Shell membrane damping (with MATX27, MATX36 only).

Default: 7 (Real)

  
DN Shell numerical damping (ISHELL = 12, 24; ISH3N = 30 only).

Default: 8(Real)

  
ITHICK Shell resultant stresses calculation flag.
CONST
Thickness is constant.
VAR
Thickness change is taken into account. Recommended to use IPLAS = NEWT

Default as defined by XSHLPRM (CONST or VAR)

  
IPLAS Shell plane stress plasticity flag (with MATX27 only).
RAD
Radial return NEWT - Iterative projection with 3 Newton iterations

Default as defined by XSHLPRM (RAD or NEWT)

  

Comments

  1. The property identification number must be that of an existing PCOMP, PCOMPG, or PCOMPP Bulk Data Entry. Only one PCOMPX property extension can be associated with a particular PCOMP, PCOMPG, or PCOMPP.
  2. PCOMPX 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 Q4 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. If ITHICK = VAR or IPLAS = NEWT, the small strain option is automatically deactivated.
  6. Defaults for DM:
    Material Element Type ISHELL/ISH3N Default
    MATX27 except QEPH, QBAT except 12, 24 5%
    QEPH 24 1.5%
    QBAT 12 0%
    MATX36 except QEPH except 24 0%
    QEPH 24 1.5%
  7. 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
  8. This card is represented as extension to a PCOMP, PCOMPG, and PCOMPP property in HyperMesh.