Rotationsbiegeversuch

Rotationsbiegeversuch, which translates to rotating bending test in English, is a fatigue testing method used to determine the fatigue strength and endurance limit of materials, particularly metals. In this test, a cylindrical specimen is subjected to a bending load while it is rotated. The bending moment is applied perpendicular to the axis of rotation, causing the outer fibers of the specimen to experience alternating tensile and compressive stresses as different parts of the specimen rotate through the loaded region.

The primary advantage of a rotationsbiegeversuch is its ability to achieve a high number of stress cycles in a relatively short period. This makes it an efficient method for fatigue testing, especially for materials with high fatigue resistance. The specimen is typically prepared with a specific geometry, often waisted in the central section to concentrate the stress and ensure failure occurs in a predictable location.

The test is conducted by mounting the specimen between two rotating chucks, with a load applied to induce bending. The load is adjusted to achieve a desired stress level, and the specimen is rotated until it fractures. By testing multiple specimens at different stress levels, a stress-life (S-N) curve can be generated, which illustrates the relationship between the applied stress amplitude and the number of cycles to failure. This curve is crucial for understanding the material's fatigue behavior and designing components that can withstand repeated loading. The rotationsbiegeversuch is widely used in engineering and materials science for quality control, material selection, and research and development.