/PRELOAD/AXIAL

Block Format Keyword Defines a preloading force applied to the set of beam, truss or spring elements.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/PRELOAD/AXIAL/preload_ID/unit_ID
preload_title
Set_ID sens_ID Fct_ID Preload Damp

Definition

Field Contents SI Unit Example
preload_ID Preloading block identifier.

(Integer, maximum 10 digits)

unit_ID (Optional) Unit identifier.

(Integer, maximum 10 digits)

preload_title Preloading block title.

(Character, maximum 100 characters)

Set_ID Set identifier.

(Integer)

sens_ID Sensor identifier.
0
The preloading stress is applied after sensor activation.

(Integer)

Fct_ID Preloading ramp function identifier as function of time (required).

(Integer)

Preload Function Y scale factor.

Default = 1.0 (Real)

[ N ]
Damp Damping ratio (between 0.0 and 1.0).

Default = 0.0 (Real)

Comments

  1. The preloading tension force is applied to the set of 1D elements Set_ID along the axis (local X: Node 1 to Node 2) or each element. This option can be used to preload a bolt modeled with 1D elements. During the preloading phase, the 1D element stiffness is reduced and reset to its input value at the end of the preloading phase.
  2. The sensor sens_ID is activated if defined. The abscissa of Fct_ID are shifted according to sensor activation time.
  3. The Fct_ID is used to ramp up the preload force in the 1D element. The preloading starts from the first point (Tstart) and stops at the last point (Tstop) of the curve.
  4. The force applied on the 1D is: Fct_ID * Preload.
  5. Use /SET/GENERAL with 1D element key SPRING (/PROP/TYPE4 (SPRING) (H > 0), /PROP/TYPE13 (SPR_BEAM), and /PROP/TYPE23 (SPR_MAT) with /MAT/LAW113 (SPR_BEAM)), BEAM (/PROP/TYPE3 (BEAM), /PROP/TYPE18 (INT_BEAM)) or TRUSS (/PROP/TYPE2 (TRUSS)). Only one type of element can be defined for each preload card.