PGAPES

Bulk Data Entry Defines electrical permittance properties for the gap elements (CGAP or CGAPG) in electrostatic analysis and piezoelectric analysis.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PGAPES PID KCPC KOPC TPID TCID

Example

Manual specification of KCPC:
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PGAPES 2 1E6
Automatic determination of KCPC:
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PGAPES 2 AUTO
Data required to request pressure-based contact CPC:
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PGAPES 2 10
Clearance and pressure-based contact CPC (3, 4),
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PGAPES 2 150.0 10 20

Definitions

Field Contents SI Unit Example
PID Property identification number. 1

No default (Integer > 0)
KCPC Permittance for the closed gap. 2
Real > 0.0
AUTO

No default
KOPC Permittance for the open gap. 2

Default = 0.0 (Real ≥ 0.0)
TPID Identification number of a TABLED# entry. This table specifies permittance per unit contact area (CPC) based on contact pressure. 3, 4

Default = Blank (Integer > 0)
TCID Identification number of a TABLED# entry. This table specifies total permittance based on gap clearance. TCID overrides KCPC for closed contact. 4

Default = Blank (Integer > 0)

Comments

  1. PGAPES provides electrical conductance for CGAP/CGAPG elements. The PID of a PGAPES entry must match a PID with an existing PGAP.
  2. KCPC represents gap permittance values for closed gaps. To facilitate reasonable values of KCPC, automatic calculation (KCPC=AUTO) is supported. This determines the value of KCPC for each gap element using the permittance of surrounding elements.
  3. TPID points to a TABLED# entry that specifies permittance per unit contact area (KCPC) based on contact pressure. Total permittance is the product of table value and actual contact area. TPID is used when electrostatic analysis uses STATSUB(STRUCTURE) to reference the contact status from a static subcase. TPID overrides KCPC in electrostatic contact analysis.
  4. TCID points to a TABLED# entry that specifies total permittance based on gap clearance. TCID overrides KCPC for closed contact. For electrostatic analysis using STATSUB(STRUCTURE) to reference the contact status from a static subcase, TCID overrides KOPC for open GAP, and KCPC for closed GAP. TCID is ignored for linear CGAP/CGAPG elements.
  5. For contact with FREEZE status, AUTO permittance is determined by OptiStruct regardless of the actual contact status (open or closed) based on geometry.
  6. Contact analysis via PCONTES and PGAPES is supported for electrostatic analysis and piezoelectric analysis.
  7. This card is represented as a property in HyperMesh.