# PELASFX

Bulk Data Entry Used to define the stiffness and stress coefficient of a scalar elastic element (spring) by means of the CELAS1 or CELAS3 entry.

This property is not affected by translational and rotational stiffness limits specified using PARAM,ELASSTIF.

## Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PELASFX PID K GE S PID K GE S

## Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PELASFX 7 4.29   7.92 27 2.17

## Definitions

Field Contents SI Unit Example
PID Unique scalar elastic property identification number.

No default (Integer > 0)

K Elastic property value.

No default (Real)

GE Damping coefficient. To obtain the damping coefficient GE, multiply the critical damping ratio, $C/{C}_{0}$ , by 2.

GE is ignored in transient analysis, if PARAM, W4 is not specified.

Default = 0.0 (Real)

S Stress coefficient.

Default = 0.0 (Real)

1. Be careful using negative spring values.
2. One or two elastic spring properties may be defined on a single entry.
3. The element force of a spring is calculated from the equation:(1)
$f=k*\left({u}_{1}-{u}_{2}\right)$
Where,
$k$
Stiffness coefficient for the scalar element.
$\mathrm{u}1$
Displacement of the first degree-of-freedom listed on the CELAS1 and CELAS3 entries.
Element stresses are calculated from the equation: (2)
$s=S*f$
Where, $S$ is the stress coefficient as defined above.
4. This card is represented as a property in HyperMesh.