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Technical Springs belong to the components with the highest cyclic and superposed static load. Nevertheless they have to fulfill the requirements of lightweight constructions. This is only possible, if high strength materials with special properties are carefully manufactured to well designed springs and special additional treatments are carried out, which impose an advantageous residual stress profile in the surface layers of the springs. After a short historical view on the spring research activities in Professor Thums area, some aspects of the fatigue behaviour of hot formed parabolic leaf springs are presented. Then the fatigue properties of cold formed helical compression springs made of different steel spring wires are discussed. Finally some results on the fatigue behaviour of helical springs at a very high number of load cycles are reported.Keywords: Hot and cold formed springs, parabolic leaf springs, helical springs, fatigue behaviour, very high cycle fatigue, spring materials, shot peening, stress peening, pre-setting.

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