# CELAS4

Bulk Data Entry Defines a scalar spring element that is connected only to scalar points without reference to a property entry.

## Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CELAS4 EID K S1 S2     GE S

## Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CELAS4 42 6.2-3 2

## Definitions

Field Contents SI Unit Example
EID Unique element identification number.

No default (Integer > 0)

K Stiffness of the scalar spring.

No default (Real)

S1, S2 Scalar point identification numbers.

S1 or S2, but not both, may be blank or zero indicating a constrained coordinate.

Default = 0 (Integer ≥ 0; S1S2)

GE Damping coefficient.

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

Default = 0.0 (Real)

S Stress coefficient.

Default = 0.0 (Real)

$f=k*\left({u}_{1}-{u}_{2}\right)$
Where, $k$ is the stiffness coefficient for the scalar element, ${u}_{1}$ is the displacement of the first degree-of-freedom listed on the CELAS1 and CELAS2 entries and ${u}_{2}$ is the displacement of the second degree-of-freedom listed on the CELAS1 and CELAS2 entries.
$s=S*f$
Where, $S$ is the stress coefficient as defined above.