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→5.1.7.1 Spring Bending Limit
====5.1.7.1 Spring Bending Limit====
The spring bending limit is defined as the boundary condition under which a standar-dized spring sample retains a deformation of 0.05 mm after initial bend stressing and subsequent force removal. The measurement is performed according to the standard EN 12384. The spring bending limit is strongly dependent on the direction of stressing with regard to the strip rolling orientation ''<xr id="fig:Direction dependence of the spring bending limit"/> (Fig. 5.38)''. Higher values are obtained if bending is perpendicular to the rolling direction as compared to parallel. This has to be considered when designing contact springs.
<figure id="fig:Direction dependence of the spring bending limit">
Fig. 5.38: Direction dependence of the spring bending limit of selected copper materials (Wieland)
[[File:Direction dependence of the spring bending limit.jpg|right|thumb|Direction dependence of the spring bending limit of selected copper materials (Wieland)]]
</figure>
====5.1.7.2 Fatigue Strength====
