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metalfatigue
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The answer METALFATIGUE has 2 possible clue(s) in existing crosswords.
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Definitions of metalfatigue in various dictionaries:
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Possible Crossword Clues |
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Result of stress that is very undesirable for air travellers? |
To iron, say, a chore — such stress may lead to collapse |
Last Seen in these Crosswords & Puzzles |
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Oct 20 2017 The Telegraph - Cryptic |
Jul 28 2012 The Times - Cryptic |
Metalfatigue might refer to |
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In materials science, fatigue is the weakening of a material caused by cyclic loading that results in progressive and localized structural damage and the growth of cracks. Once a crack has initiated, each loading cycle will grow the crack a small amount, typically producing striations on some parts of the fracture surface. The crack will continue to grow until it reaches a critical size which occurs when the stress intensity factor of the crack exceeds the fracture toughness of the material producing rapid propagation and typically complete fracture of the structure. * Fatigue has traditionally been associated with the failure of metal components which lead 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. Most materials seem to experience some sort of fatigue-related failure such as composites, plastics and ceramics.To aid in predicting the fatigue life of a component, fatigue tests are carried out using coupons to measure the rate of crack growth by applying constant amplitude cyclic loading and averaging the measured growth of a crack over thousands of cycles. However, in order to predict the fatigue life of a component, there are a number of special cases that need to be considered where the rate of crack growth obtained from these tests needs adjustment. Such as: the reduced rate of growth that occurs for small loads near the threshold or after the application of an overload; and the increased rate of crack growth associated with short cracks or after the application of an underload.If the loads are above a certain threshold, microscopic cracks will begin to initiate at stress concentrations such as holes, persistent slip bands (PSBs), composite interfaces or grain boundaries in metals. The nominal maximum stress values that cause such damage may be much less than the strength of the material, typically quoted as the ultimate tensile stress limit, or the yield stress limit. |