nonlinear spring¶

Module: solid

Category: discretematerial

Type string: "nonlinear spring"

Parameters¶

Name	Description	Default	Units
`scale`	scale	1	[]
`measure`	measure	0	[]
`force`			[]

Description¶

The nonlinear spring allows users to define a custom relation between a measure of stretch and the spring force.

The measure parameter can be set to one of the following values:

elongation: Use the spring elongation, the difference between current and original length, as the measure of stretch.
strain: Use the strain, i.e. the ratio of elongation over original length, as the measure of stretch
stretch: Use the ratio of current length over original length as measure of stretch.

Example:

<discrete_material id="1" name="set1" type="nonlinear spring">
    <scale>1</scale>
    <measure>elongation</measure>
    <force type="math">
        <math>x</math>
    </force>
</discrete_material>