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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. Buckling - Wikipedia

    en.wikipedia.org/wiki/Buckling

    In structural engineering, buckling is the sudden change in shape ( deformation) of a structural component under load, such as the bowing of a column under compression or the wrinkling of a plate under shear. If a structure is subjected to a gradually increasing load, when the load reaches a critical level, a member may suddenly change shape ...

  4. Fatigue - Wikipedia

    en.wikipedia.org/wiki/Fatigue

    Definition. 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 ...

  5. Central nervous system fatigue - Wikipedia

    en.wikipedia.org/wiki/Central_Nervous_System_Fatigue

    Central nervous system fatigue, or central fatigue, is a form of fatigue that is associated with changes in the synaptic concentration of neurotransmitters within the central nervous system (CNS; including the brain and spinal cord) which affects exercise performance and muscle function and cannot be explained by peripheral factors that affect muscle function.

  6. Fatigue testing - Wikipedia

    en.wikipedia.org/wiki/Fatigue_testing

    Each 16 hour flight took 11 minutes to simulate on the fatigue test rig. [1] Fatigue testing is a specialised form of mechanical testing that is performed by applying cyclic loading to a coupon or structure. These tests are used either to generate fatigue life and crack growth data, identify critical locations or demonstrate the safety of a ...

  7. Ratcheting - Wikipedia

    en.wikipedia.org/wiki/Ratcheting

    Ratcheting is a progressive, incremental inelastic deformation characterized by a shift of the stress-strain hysteresis loop along the strain axis. [4] When the amplitude of cyclic stresses exceed the elastic limit, the plastic deformation that occurs keep accumulating paving way for a catastrophic failure of the structure.

  8. Myalgic encephalomyelitis/chronic fatigue syndrome - Wikipedia

    en.wikipedia.org/.../chronic_fatigue_syndrome

    About 0.17% to 0.89% (pre-pandemic) [9] Myalgic encephalomyelitis/chronic fatigue syndrome ( ME/CFS) is a serious long-term illness. People with ME/CFS experience a profound fatigue that does not go away with rest, sleep issues and problems with memory or concentration. They are able to do much less than before they became ill.

  9. Sentence clause structure - Wikipedia

    en.wikipedia.org/wiki/Sentence_clause_structure

    A sentence consisting of at least one dependent clause and at least two independent clauses may be called a complex-compound sentence or compound-complex sentence. Sentence 1 is an example of a simple sentence. Sentence 2 is compound because "so" is considered a coordinating conjunction in English, and sentence 3 is complex.

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