StejskalTanneranalysen

StejskalTanneranalysen is a computational method used in the field of materials science to predict the long-term mechanical behavior of materials, particularly polymers and composites, under sustained stress. Developed by J. Stejskal and D. Tanner, the analysis is based on the concept of time-temperature superposition, a principle that allows for the extrapolation of material properties from short-term experiments conducted at elevated temperatures to predict behavior at lower temperatures over extended periods.

The core of the StejskalTanneranalysen involves constructing a master curve, which represents the material's response over a wide range of time scales. This is achieved by applying a shift factor to experimental data obtained at different temperatures. This shift factor accounts for the change in molecular mobility of the material with temperature. By accurately determining this shift factor, often through fitting to established models like the Williams-Landel-Ferry (WLF) equation, the long-term performance of a material can be estimated without the need for excessively long experimental durations.

This analytical approach is valuable for engineering applications where materials are subjected to constant loads for many years, such as in structural components, insulation, or coatings. It helps engineers to design for durability and prevent premature failure by understanding how creep, stress relaxation, and fatigue will manifest over the intended service life of the material. The StejskalTanneranalysen provides a powerful tool for material characterization and predictive modeling.