Fatigue testing stress/strain, cyclic nature

The analysis of the processes leading to the degradation of solids and various materials is of interest in many different aspects. These include the analysis of the properties of materials, the nature and character of the stressed state, and the means by which loads are applied. The latter include testing using constant strain rates, creep analysis, measurements of stability with loads applied over extended periods of time, resistance to impact, cyclic fatigue, and many others. Numerous standard test methods were developed for various materials under different conditions. The influence of the specific conditions, such as temperature, humidity, and the presence of surface-active substances also represents the subject of essential studies. Depending on the particular combination of all these factors, a particular type of material degradation can be observed. 

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