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For Force as function of extension enter an expression for the spring force Fs. The expression must be a function of the extension of the spring. The built-in variable for the spring extension has the form <physicsName>.<SpringNodeTag>.dl, for example truss.spd1.dl. The default expression is (1[N/m])*truss.spd1.dl, which corresponds to a linear spring with the stiffness 1 N/m.
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For Specify initial extension enter a value for Δl0. The free length is computed as lf = l0 − Δl0, where l0 is the initial distance between the connection points.
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