# Boundary Condition: Spring

## Function:

Defines a linear element (line) into a two-node spring element.

## Application:

Line.

## Description:

The spring element is defined by a cross-sectional area (in m2). Additionally, an elastic material must be applied to the spring.

## Remarks:

- The spring element has a distributed mass, and thus properly takes dynamic effects into account.
- There is no transverse stiffness in the spring element. Therefore, lateral movements should be clamped or constrained.
- It is recommended to use only one mesh element per spring. Use Meshing | Structured | Lines and assign 1 subdivision.
- When used on a line of symmetry, the cross-sectional area of the spring element must be divided by the appropriate factor of symmetry.

## Illustration:

## ATILA Equivalent:

- A GEOMETRY entry is created with the cross-sectional area of the spring.
- A section with SPRI02E elements is created.

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