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!SPRING_A¶
Definition of an axial spring.
For the two nodes connected by a 2-node connector element (element type 511), this defines a spring acting along the axis connecting those two nodes. The spring direction follows deformation of the model. To define a spring connecting specific degrees of freedom, use !SPRING_D.
Definition in the Mesh Data¶
!SPRING_A specifies the spring constant as a material property; this keyword alone does not create a spring. The following two definitions are required in the mesh data (msh).
- An element of type 511 whose connectivity consists of the two nodes connected by the spring (→
!ELEMENT) - A section with
TYPE=INTERFACEfor that element group (→!SECTION). ForMATERIAL, specify the name of the material whose spring constant is defined by this keyword
Parameters¶
None
** 2nd line **
Specify the axial spring coefficient.
| Variable name | Attribute | Description |
|---|---|---|
| SPRING_COEFF | R | Spring constant |
Example¶
When defining an axial spring (spring constant 1000) connecting node 1 and node 2
msh
!ELEMENT, TYPE=511, EGRP=ESPRING
1, 1, 2
!SECTION, TYPE=INTERFACE, EGRP=ESPRING, MATERIAL=SPRING1
1.0
cnt
Notes¶
- An axial spring has stiffness only in the axial component. Degrees of freedom normal to the spring axis must be constrained or supported by other elements.
- If the coordinates of the two nodes coincide (spring length is 0), the axial direction is undefined, so the spring constant is applied equally in the three directions.
- A material for which a spring constant is defined is treated as a material dedicated to connector elements. It cannot be shared with solid elements by assigning elastic properties to the same material name.
!SPRING_Ais a connector-element spring connecting two nodes and serves a different purpose from!SPRING, which is a boundary condition that elastically supports a node against the ground.