In materials science , uses loads of fatigue caused by the weakness of material over and over again . This is a gradual localized structural damage that occurs when the material is exposed to cyclic loading . Stressvalues maximum value that caused this damage could be much less than the tensile strength of the material usually as surface tension , reduce or restrict the effort described below.
For the following reasons :
Fatigue happens when you download the materials and discharged several times. If you download a certain threshold , and microscopic cracks will begin to focus on the level of stress, and slip bands Pollutants ( PSBs ) and total interfaces . Finally, the crack reaches critical size , the crack suddenly released , and the structure will fail .
Fatigue life of ASTM, NF is defined as the number of stress cycles of a specific nature is to keep the specimen before failure occurs, the specific nature .
Fatigue properties :
• Fatigue is a process that has a degree of chance , showing the often large scatter even in controlled also .
• fatigue normally associated with tensile stress , were reported crack fatigue loads due to pressure .
• Increasing the amplitude of the applied stress , and longer life.
• dispersion tends to increase the fatigue life fatigue strength is .
• cumulative damage . The rest of the material to recover.
• 1837: Wilhelm Albert publishes the first article on fatigue . He designed the test machine to conveyor chains used in the Clausthal mines .
• 1842: William John Rankin Macquorn importance of stress concentrations in their research failed to recognize rail hubs . Versailles train crash in central fatigue .
• 1903: Sir James...
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• In 1977 , Dan Air Boeing 707 accidents caused by fatigue failure resulting in loss of the right horizontal stabilizer
• 1980 Volume LOT 7, drive shaft turbine , causing a rupture in the engine leads to loss of control accidents due to fatigue
• 1985 Japan Airlines Flight 123 crashed after a set vertical tail due to repair faulty on the back wall and lost.
1. P. C. Paris, M. P. Gomez and W. E. Anderson. A rational analytic theory of fatigue. The Trend in Engineering (1961). 13, 9-14.
2. 2. Matsuishi, M., Endo, T., 1968, subject to metal fatigue stress changes, and the Japan Society of Mechanical Engineers, Jukvoka and Japan.
3. Milella PP (2013), "washroom fatigue" fatigue and corrosion of metals, Springer, p. 768www.google.com
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