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.