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→6.4.7 Contact Spring Calculations
For springs with a circular cross-sectional area the momentum of inertia is
:<math>J=\pi D^4/64</math>
<math>D= Durchmesser</math>
To avoid plastic deformation of the spring the max bending force σ <sub>max</sub> cannot be maxexceeded Fmax:<math>σ_max = \frac {3 x E x D xmax2L²}{2L^2}x_max</math>
The stress limit is defined through the fatigue limit and the 0.2% elongation limit
