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`


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


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; `S1` ≠ `S2`)
`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)

This single entry completely defines the element since no material or geometric properties are required.
Only one scalar spring element may be defined on a single entry.
A scalar point specified on this entry does not need to be defined on a SPOINT Bulk Data Entry.
The element force of a spring is calculated from the equation:
$f = k * (u_{1} - u_{2})$
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.

Element stresses are calculated from the equation:
$s = S * f$
Where, $S$ is the stress coefficient as defined above.
This card is represented as a spring or mass element in HyperMesh.