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Fatigue is a major safety concern in many fields, but especially in transportation, because fatigue can result in disastrous accidents. Fatigue is considered an internal precondition for unsafe acts because it negatively affects the human operator's internal state. Research has generally focused on pilots, truck drivers, and shift workers.
Harvard Fatigue Laboratory (1927–1947) was a research centre designed to investigate the physiological, sociological and psychological impacts of fatigue caused by daily activities, and those on the conditions that industry workers faced at the time. [1]
Fatigue is a process that has a degree of randomness , often showing considerable scatter even in seemingly identical samples in well controlled environments. Fatigue is usually associated with tensile stresses but fatigue cracks have been reported due to compressive loads. [10] The greater the applied stress range, the shorter the life.
The International Follow-On Structural Fatigue Test Program (IFOSTP) was a joint venture between Australia, Canada and the U.S. to fatigue test the F/A-18 Hornet. The Australian test involved the use of electrodynamic shakers and pneumatic airbags to simulate high angle of attack buffet loads over the empennage .
ε f ' is an empirical constant known as the fatigue ductility coefficient defined by the strain intercept at 2N =1; c is an empirical constant known as the fatigue ductility exponent, commonly ranging from -0.5 to -0.7. Small c results in long fatigue life. ς f ' is a constant known as the fatigue strength coefficient
Work Measurement is a technique for establishing a Standard Time, which is the required time to perform a given task, based on time measurements of the work content of the prescribed method, with due consideration for fatigue and for personal and unavoidable delays.
Fractography can determine whether a cause of train derailment was a faulty rail, or if a wing of a plane had fatigue cracks before a crash. Fractography is used also in materials research, since fracture properties can correlate with other properties and with structure of materials.
Fatigue in a medical context is used to cover experiences of low energy that are not caused by normal life. [2] [3]A 2021 review proposed a definition for fatigue as a starting point for discussion: "A multi-dimensional phenomenon in which the biophysiological, cognitive, motivational and emotional state of the body is affected resulting in significant impairment of the individual's ability to ...