PWELD

Bulk Data Entry Defines properties of connector (CWELD) elements.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PWELD PID MID D MSET TYPE
DTAB TID

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PWELD 30 2 2.5

Definitions

Field Contents SI Unit Example
PID Property identification number.

No default (Integer > 0)
MID Material identification number. 1

No default (Integer > 0)
D Diameter of the connector. 1

No default (Real > 0.0)
MSET Flag to eliminate m-set degrees-of-freedom.
ON
Generates explicit m-set constraints.
OFF (Default)
Incorporates constraints at the element stiffness matrix level avoiding explicit m-set constraint equations. The exact same results will be obtained regardless of this choice.
TYPE Connection type. 2
SPOT
Indicates spot weld connector. Set to activate Spot Weld Fatigue Analysis.
blank (Default)
Indicates general connector.
DTAB The weld element diameter is determined from the table TID.
TID Identification number of a TABLEDi entry that defines the weld element diameter as a function of the minimum shell thickness of the corresponding shell elements (sheets). 3

No default (Integer > 0)

Comments

  1. Material MID, diameter D, and the length are used to calculate the stiffness of the connector in 6 directions. MID can only refer to the MAT1 Bulk Data Entry. The length is the distance of GA to GB.


    Figure 1. Length and Diameter of Weld Connector
  2. If TYPE=SPOT and if the formats PARTPAT, ELPAT, or ELEMID on the CWELD entry are used, then the effective length for the stiffness of the CWELD element is set to Le=1/2(tA+tB) regardless of the distance GA to GB. tA and tB are the shell thicknesses of shell A and B, respectively. For all other cases, the effective length of the CWELD element is equal to the true length, the distance of GA and GB, as long as the ratio of length to diameter is in the range 0.2≤L/D≤5.0 . If L is below the range, the effective length is set to Le = 0.2D and if L is above the range, the effective length is set to Le = 5.0D.
  3. The TID field references a TABLEDi entry that defines the weld diameter as a function of minimum attached shell thicknesses.
    • TID consists of list of minimum thickness values (X) versus corresponding weld diameters (Y).
    • From the table TID lookup you get Y (weld diameter) for the min thickness (used for the lookup).
  4. This card is represented as a property in HyperMesh.