DCOMP

Bulk Data Entry Defines manufacturing constraints for composite sizing optimization.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
DCOMP	`ID`	`ETYPE`	`EID1`	`EID2`	`EID3`	`EID4`	`EID5`	`EID6`
+		`EID7`	etc.
+	`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`

Definitions

Field	Contents	SI Unit Example
`ID`	Unique identification number. No default (Integer > 0)
`ETYPE`	Entity type for which this DCOMP card is defined. PCOMP STACK No default
`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 (Default) The core is excluded. 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: BYAND (Default) Orientation 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. Supported options are: NONE Plies are not excluded. CORE (Default) The core is excluded. 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: BYANG (Default) Orientation 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. Supported options are: NONE Plies are not excluded. CORE (Default) The core is excluded. 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: BYANG (Default) Orientation 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: BYANG (Default) Orientation 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. 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: BYANG (Default) Orientation 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. Supported options are: NONE Plies are not excluded. CORE (Default) The core is excluded. CONST Plies defined in the `CONST` constraint are excluded. BOTH CORE and CONST are considered.

Comments

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.
These constraints are automatically created after performing free-sizing optimization when the OUTPUT,FSTOSZ control card is activated.
For a more detailed description and an example, refer to Optimization of Composite Structures in the User Guide.
Older versions of the DCOMP card (OptiStruct version 11.0 and prior) are supported and handled appropriately.
The option for selecting the type of drop-off constraints for PDTYP is defined for a set of plies.
The option for PDTYP in DCOMP is:

Figure 1. TOTDRP

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

Figure 2.
This card is represented as an optimization design variable in HyperMesh.