lyhytsykliset

lyhytsykliset is a Finnish term that translates to "short-cycled" or "low-cycle" in English. It is often used in the context of fatigue in materials science and engineering. Low-cycle fatigue refers to the phenomenon where a material fails after a relatively small number of stress cycles, typically less than 10,000. This occurs when the applied stresses are high enough to cause significant plastic deformation in each cycle.

The study of lyhytsykliset fatigue is crucial for designing structures and components that are subjected to repeated, high-amplitude loading. Examples include aircraft components, pressure vessels, and automotive parts that experience significant stress variations during their operational life. Unlike high-cycle fatigue, which is characterized by elastic deformation and often predicted using S-N curves, low-cycle fatigue is dominated by plastic strain accumulation.

Key parameters in analyzing lyhytsykliset fatigue include the strain amplitude and the number of cycles to failure. Experimental methods like strain-controlled fatigue testing are employed to determine the fatigue life of materials under these conditions. Understanding the material's behavior, such as its cyclic stress-strain response and ductility, is essential for accurate prediction and prevention of lyhytsykliset failure. Factors like temperature, environment, and the presence of defects can also significantly influence the low-cycle fatigue life of a material.