Niederzyklusbereich

The Niederzyklusbereich, often translated as "low cycle zone" or "low cycle range," refers to a region or condition within a material or system where deformation occurs over a relatively small number of cycles. This is in contrast to the high cycle fatigue regime, which involves a large number of stress or strain cycles. The Niederzyklusbereich is characterized by significant plastic deformation during each cycle.

Materials subjected to loading within the Niederzyklusbereich typically experience failure after a limited number of cycles, often in the range of a few hundred to several tens of thousands. This type of loading is common in applications where components undergo substantial stress variations, such as in aircraft landing gear, turbine blades, and earthquake-resistant structures. The plastic strain amplitude is the primary parameter governing fatigue life in this regime.

Understanding the behavior of materials in the Niederzyklusbereich is crucial for designing components that can withstand repeated significant deformations without premature failure. Analysis often involves using cyclic stress-strain curves and fatigue damage models that account for plastic strain accumulation. The phenomena observed, like crack initiation and propagation, can differ significantly from those in the high cycle fatigue range due to the larger plastic deformation involved.