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  2. 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]

  3. Bernard Haigh - Wikipedia

    en.wikipedia.org/wiki/Bernard_Haigh

    Bernard Parker Haigh, MBE [1] (8 July 1884 [2] [3] – 18 January 1941) [4] [5] was a Scottish mechanical engineer. Haigh was educated at Allan Glen's School [ 6 ] and the University of Glasgow He served as professor of applied mechanics at the Royal Naval College in Greenwich .

  4. Lode coordinates - Wikipedia

    en.wikipedia.org/wiki/Lode_Coordinates

    Lode coordinates (,,) or Haigh–Westergaard coordinates (,,). [ 1 ] are a set of tensor invariants that span the space of real , symmetric , second-order, 3-dimensional tensors and are isomorphic with respect to principal stress space .

  5. Rainflow-counting algorithm - Wikipedia

    en.wikipedia.org/wiki/Rainflow-counting_algorithm

    Rainflow counting identifies the closed cycles in a stress-strain curve. The rainflow-counting algorithm is used in calculating the fatigue life of a component in order to convert a loading sequence of varying stress into a set of constant amplitude stress reversals with equivalent fatigue damage.

  6. Crack growth equation - Wikipedia

    en.wikipedia.org/wiki/Crack_growth_equation

    A crack growth equation is used for calculating the size of a fatigue crack growing from cyclic loads. The growth of a fatigue crack can result in catastrophic failure, particularly in the case of aircraft. When many growing fatigue cracks interact with one another it is known as widespread fatigue damage. A crack growth equation can be used to ...

  7. 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 ...

  8. File:IAH diagram.pdf - Wikipedia

    en.wikipedia.org/wiki/File:IAH_diagram.pdf

    Original file (806 × 1,237 pixels, file size: 321 KB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.

  9. Stress space - Wikipedia

    en.wikipedia.org/wiki/Stress_space

    Visualisation of a Cauchy stress tensor σ in the Haight-Westergaard stress space. In continuum mechanics, Haigh–Westergaard stress space, or simply stress space is a 3-dimensional space in which the three spatial axes represent the three principal stresses of a body subject to stress.