PCOMPX

Bulk Data Entry

PCOMPX – Optional Composite Laminate Property Extension for Geometric Nonlinear Analysis

Description

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

(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

Field	Contents
PID	Property ID of the associated PSHELL. See comment 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: 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. 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%
MATX36	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.