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  2. Fatigue (material) - Wikipedia

    en.wikipedia.org/wiki/Fatigue_(material)

    Fatigue has traditionally been associated with the failure of metal components which led to the term metal fatigue. In the nineteenth century, the sudden failing of metal railway axles was thought to be caused by the metal crystallising because of the brittle appearance of the fracture surface, but this has since been disproved. [ 1 ]

  3. Goodman relation - Wikipedia

    en.wikipedia.org/wiki/Goodman_relation

    Within the branch of materials science known as material failure theory, the Goodman relation (also called a Goodman diagram, a Goodman-Haigh diagram, a Haigh diagram or a Haigh-Soderberg diagram) is an equation used to quantify the interaction of mean and alternating stresses on the fatigue life of a material. [1]

  4. Fatigue limit - Wikipedia

    en.wikipedia.org/wiki/Fatigue_limit

    The fatigue limit or endurance limit is the stress level below which an infinite number of loading cycles can be applied to a material without causing fatigue failure. [1] Some metals such as ferrous alloys and titanium alloys have a distinct limit, [ 2 ] whereas others such as aluminium and copper do not and will eventually fail even from ...

  5. Strength of materials - Wikipedia

    en.wikipedia.org/wiki/Strength_of_materials

    Strength parameters include: yield strength, tensile strength, fatigue strength, crack resistance, and other parameters. [citation needed] Yield strength is the lowest stress that produces a permanent deformation in a material.

  6. Rainflow-counting algorithm - Wikipedia

    en.wikipedia.org/wiki/Rainflow-counting_algorithm

    This simplification allows the number of cycles until failure of a component to be determined for each rainflow cycle using either Miner's rule to calculate the fatigue damage, or in a crack growth equation to calculate the crack increments. [2] Both methods give an estimate of the fatigue life of a component.

  7. Low-cycle fatigue - Wikipedia

    en.wikipedia.org/wiki/Low-cycle_fatigue

    Δε e /2 is the elastic strain amplitude; 2N is the number of reversals to failure (N cycles); 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 ...

  8. Paris' law - Wikipedia

    en.wikipedia.org/wiki/Paris'_law

    Paris' law (also known as the Paris–Erdogan equation) is a crack growth equation that gives the rate of growth of a fatigue crack. The stress intensity factor K {\displaystyle K} characterises the load around a crack tip and the rate of crack growth is experimentally shown to be a function of the range of stress intensity Δ K {\displaystyle ...

  9. Critical plane analysis - Wikipedia

    en.wikipedia.org/wiki/Critical_plane_analysis

    Modern procedures for critical plane analysis trace back to research published in 1973 in which M. W. Brown and K. J. Miller observed that fatigue life under multiaxial conditions is governed by the experience of the plane receiving the most damage, and that both tension and shear loads on the critical plane must be considered.