S-Ply® leaf springs
S-Ply® leaf springs consist of layered and compressed UD (unidirectional) prepreg plies. The mechanical properties of an S-Ply® leaf spring may be adapted to customer requirements and application during production by orienting individual prepreg layers to each other. S-Ply® leaf springs offer superior properties to steel leaf springs in many applications.
- Unidirectional fibres The reinforcing fibres in the leaf springs consist of strictly parallel-oriented glass or carbon fibres that are not woven together. The fibres are not pre-stretched and not kinked. In contrast to metallic materials with an isotropic structure, they are direction-dependent and may therefore be aligned to form a material-specific design
- Epoxy resin matrix Epoxy resin systems serve as binders. Their special composition ensures very good adhesion to the glass surface, resulting in optimal dynamic and electrical properties. The ratio of matrix resin and reinforcing fibres is formulated in such a way that all the advantages of the selected raw materials are used as a composite material.
- The matrix takes on a number of important tasks. It fixes the fibre in the desired configuration and supports it against buckling under compressive stress. In addition, it has force-bearing function, thus transferring the forces into the fibres. The polymer matrix therefore plays a key influence on toughness and damage tolerance of the composites.
- Tried and tested long-term strength The long-term strength of S-Ply leaf springs was tested by IMA Material Research and Application Technology Dresden in a Wöhler test. As a function of the deflection voltage, the resulting Wöhler curve indicates the number of tolerable load changes up to expected fatigue failure. Up to a load change of 108 cycles, fatigue strength is expected.