PGAPEC
Bulk Data Entry Defines electrical conductance properties for the gap elements (CGAP or CGAPG) in electrical analysis.
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| PGAPEC | PID | KCEC | KOEC | TPID | TCID |
Examples
Manual specification of KCEC:
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| PGAPEC | 2 | 1E6 |
Automatic determination of KCEC:
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| PGAPEC | 2 | AUTO |
Data required to request pressure-based contact CEC:
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| PGAPEC | 2 | 10 |
Definitions
| Field | Contents | SI Unit Example |
|---|---|---|
| PID | Property identification
number. 1 No default (Integer > 0) |
|
| KCEC | Conductance for the closed
gap. 2
No default |
|
| KOEC | Conductance for the open
gap. 2 Default = 0.0 (Real ≥ 0.0) |
|
| TPID | Identification number of a
TABLED# entry. This table specifies total
conductance based on gap pressure. TPID overrides
KCEC for closed contact. 3 Default = Blank (Integer > 0) |
|
| TCID | Identification number of a
TABLED# entry. This table specifies total
conductance based on gap clearance. TCID
overrides KCEC for closed contact. 4 Default = Blank (Integer > 0) |
Comments
- PGAPEC provides electrical conductance for CGAP/CGAPG elements. The PID of a PGAPEC entry must match a PID with an existing PGAP.
- KCEC represents gap conductance
values for closed gaps. Theoretically, while higher conductance values enforce a
perfect conductor, excessively high values may cause poor conditioning of the
conduction matrix. If such conditions are observed, you may need to decrease the
value of gap conductance. When gap is open, no electricity goes through the gap
and the conductance is infinite (unless KOEC is defined). To
stabilize conduction matrix, KCEC*1.0E-14 is used for open
gap electrical conductance.
To facilitate reasonable values of KCEC, automatic calculation (KCEC=AUTO) is supported. This determines the value of KCEC for each gap element using the conductance of surrounding elements.
- TPID points to a TABLED# entry that specifies electric conductance per unit contact area (KCEC) based on contact pressure. Total conductance is the product of the table value and actual contact area. TPID is used when electric conduction analysis uses STATSUB(STRUCTURE) to reference the contact status from a static subcase or in coupled electro-thermal-structure analysis. TPID overrides KCEC in electrical conduction contact analysis and electro-thermal-structure analysis.
- TCID points to a TABLED# entry that specifies total conductance based on gap clearance. TCID overrides KCEC for closed contact. For coupled electric contact analysis where a nonlinear static/transient subcase provides contact status for electric contact, TCID overrides KOEC for open GAP, and KCEC for closed GAP. TCID is ignored for linear CGAP/CGAPG elements.
- Electrical contact with FREEZE status, AUTO conductance is determined by OptiStruct regardless of the actual contact status (open or closed) based on geometry.
- Electrical Contact Analysis via PCONTEC and PGAPEC is supported for Steady-State Electric analysis, Multi-Steady Electric analysis, and Electro-Thermal-Structural coupling analysis.
- This card is represented as a property in HyperMesh.