# A Course in Modern Icelandic by Friðjónsson, Jón

By Friðjónsson, Jón

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A fatigue loading may be deﬁned in terms of the time function S(t). In many metal fatigue applications, material behaviour can be considered to be linearly elastic so that S is proportional to F , and the two approaches are equivalent (Frost et al. 1974). 1) and S varies in a regular cyclic manner. 1) where Sm is mean reference stress, Sa alternating reference stress, f frequency of load application and t time. The process is statistically stationary in that the coefﬁcients Sm , Sa and f are unaffected by a shift of the origin along the time axis, that is they are independent of time.

1). Stage I crack propagation is encouraged by plasticity (Pook 2002a). For convenience, the term fatigue crack initiation sometimes includes Stage I fatigue crack propagation. 12. Striations on the fracture surface of a Al-4%Cu alloy, direction of propagation left to right, spacing approximately 2 µm. when it reaches a critical length, changes direction and propagates normal to the maximum principal tensile stress. 1). The critical length is strongly dependent on microstructural features and on stress conditions, and varies widely.

19(b). Other conventions are sometimes used; for example, results may be plotted in terms of the maximum stress in the fatigue cycle, σmax , rather than the alternating stress. For tests on components, it is sometimes convenient to use the applied fatigue load rather than a stress. 3 Scatter in Fatigue Data By its very nature, metal fatigue is a random process, and the consequent scatter of results, even in carefully controlled experiments, complicates both the analysis of experimental data and their subsequent application to practical problems.