DCOMP

Bulk Data Entry

DCOMP – Manufacturing Constraints for Composite Sizing Optimization

Description

Defines manufacturing constraints for composite sizing optimization.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
DCOMP	ID	ETYPE	EID1	EID2	EID3	EID4	EID5	EID6
+		EID7	…
+	LAMTHK	LTMIN	LTMAX	LTSET	LTEXC
+	PLYTHK	PTGRP	PTMIN	PTMAX	PTOPT	PTSET	PTEXC
+	PLYPCT	PPGRP	PPMIN	PPMAX	PPOPT	PPSET	PPEXC
+	BALANCE	BGRP1	BGRP2		BOPT
+	CONST	CGRP	CTHICK		COPT
+	PLYDRP	PDGRIP	PDTYP	PDMAX	PDOPT	PDSET	PDEXC

Field	Contents
ID	Unique identification number. No default (Integer > 0)
ETYPE	Entity type for which this DCOMP card is defined. No default (PCOMP or STACK)
EID#	Entity identification numbers. List of entities of type ETYPE for which this DCOMP card is defined. No default (Integer > 0)
LAMTHK	Indicates that laminate thickness constraints are applied. Multiple LAMTHK constraints are allowed.
LTMIN	Minimum laminate thickness for the LAMTHK constraint. Default = blank (Real > 0.0)
LTMAX	Maximum laminate thickness for the LAMTHK constraint. Default = blank (Real > 0.0 and > LTMIN)
LTSET	Set ID of elements to which the LAMTHK constraint is applied.
LTEXC	Exclusion flag indicates that certain plies are excluded from the LAMTHK constraint. The following options are supported: NONE: Plies are not excluded. CORE: The core is excluded (Default). CONST: Plies defined in the CONST constraint are excluded. BOTH: CORE and CONST are considered.
PLYTHK	Indicates that ply thickness constraints are applied. Multiple PLYTHK constraints are allowed.
PTGRP	Ply orientation in degrees, ply sets or ply IDs, to which the PLYTHK constraint is applied, depending on the PTOPT selection. No default (Real or Integer)
PTMIN	Minimum thickness for the PLYTHK constraint. Default = blank (Real > 0.0)
PTMAX	Maximum thickness for the PLYTHK constraint. Default = blank (Real > 0.0 and > PTMIN)
PTOPT	Ply selection options for the PLYTHK constraint. Plies can be selected based on the following: BYANG: Orientation (Default) BYSET: Ply sets BYPLY: Ply IDs
PTSET	Set ID of elements to which the PLYTHK constraint is applied.
PTEXC	Exclusion flag indicates that certain plies are excluded from the PLYTHK constraint. The following options are supported: NONE: Plies are not excluded. CORE: The core is excluded (Default). CONST: Plies defined in the CONST constraint are excluded. BOTH: CORE and CONST are considered.
PLYPCT	Indicates that ply thickness percentage constraints are applied. Multiple PLYPCT constraints are allowed.
PPGRP	Ply orientation in degrees, ply sets or ply IDs, to which the PLYPCT constraint is applied, depending on the PPOPT selection. No default (Real or Integer)
PPMIN	Minimum percentage thickness for the PLYPCT constraint. Default = blank (Real > 0.0 and < 1.0)
PPMAX	Maximum percentage thickness for the PLYPCT constraint. Default = blank (Real > 0.0, < 1.0 and > PPMIN)
PPOPT	Ply selection options for the PLYPCT constraint. Plies can be selected based on the following: BYANG: Orientation (Default) BYSET: Ply sets BYPLY: Ply IDs
PPSET	Set ID of elements to which the PLYPCT constraint is applied.
PPEXC	Exclusion flag indicates that certain plies are excluded from the PLYPCT constraint. The following options are supported: NONE: Plies are not excluded. CORE: The core is excluded (Default). CONST: Plies defined in the CONST constraint are excluded. BOTH: CORE and CONST are considered.
BALANCE	Indicates that a balancing constraint is applied. Multiple BALANCE constraints are allowed.
BGRP1	First ply orientation in degrees, ply sets or ply IDs, to which the BALANCE constraint is applied, depending on the BOPT selection. No default (Real or Integer)
BGRP2	Second ply orientation in degrees, ply sets or ply IDs, to which the BALANCE constraint is applied, depending on the BOPT selection. No default (Real or Integer)
BOPT	Ply selection options for the BALANCE constraint. Plies can be selected based on the following: BYANG: Orientation (Default) BYSET: Ply sets BYPLY: Ply IDs
CONST	Indicates that a constant thickness constraint is applied. Multiple CONST constraints are allowed.
CGRP	Ply orientation in degrees, ply sets or ply IDs, to which the CONST constraint is applied, depending on the COPT selection. No default (Real or Integer)
CTHICK	Constant ply thickness for the CONST constraint. No default (Real > 0.0)
COPT	Ply selection options for the CONST constraint. Plies can be selected based on the following: BYANG: Orientation (Default) BYSET: Ply sets BYPLY: Ply IDs
PLYDRP	Indicates that ply drop-off constraints are applied. Multiple PLYDRP constraints are allowed.
PDGRIP	Ply orientation in degrees, ply sets or ply IDs, to which the PLYDRP constraint is applied, depending on the PDOPT selection. No default (Real or Integer)
PDTYP	Specifies the type of the drop-off constraint as: TOTDRP (Comment 5).
PDMAX	Maximum allowed drop-off for the PLYDRP constraint. No default (Real > 0)
PDOPT	Ply selection options for the PLYDRP constraint. Plies can be selected based on the following: BYANG: Orientation (Default) BYSET: Ply sets BYPLY: Ply IDs
PDSET	Set IDs of elements to which the PLYDRP constraint is applied.
PDEXC	Exclusion flag indicates certain plies are excluded from the PLYDRP constraint. The following options are supported: NONE: Plies are not excluded. CORE: The core is excluded (Default). CONST: Plies defined in the CONST constraint are excluded. BOTH: CORE and CONST are considered.

Comments

1.	The following manufacturing constraints are available for ply-based composite sizing optimization:

•	Lower and upper bounds on the total thickness of the laminate (LAMTHK)

•	Lower and upper bounds on the thickness of a given orientation (PLYTHK)

•	Lower and upper bounds on the thickness percentage of a given orientation (PLYPCT)

•	Manufacturable ply thickness (PLYMAN)

•	Linking between the thicknesses of two given orientations (BALANCE)

•	Constant (non-designable) thickness of a given orientation (CONST)

•	LAMTHK, PLYTHK and PLYPCT can be applied locally to sets of elements. There can be elements that do not belong to any set.

2.	These constraints are automatically created after performing free-sizing optimization when the OUTPUT,FSTOSZ control card is activated.

3.	For a more detailed description and an example, refer to Optimization of Composite Structures in the User’s Guide.

4.	Older versions of the DCOMP card (OptiStruct version 11.0 and prior) are supported and handled appropriately.

5.	The option for selecting the type of drop-off constraints for PDTYP is defined for a set of plies, as shown in the figure below:

The option for PDTYP in DCOMP is: TOTDRP.

dcomp_stacked_plies

Assuming that the plies are stacked as shown above, the following definition is:

dcomp_totdrp

6.	This card is represented as an optimization designvariable in HyperMesh.