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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 ...
The fatigue limit under cyclic load is 97 MPa (14 ksi) for 500,000,000 completely reversed cycles using a standard RR Moore test machine and specimen. [12] Note that aluminium does not exhibit a well defined "knee" on its S-N curve , so there is some debate as to how many cycles equates to "infinite life".
For some materials, notably steel and titanium, there is a theoretical value for stress amplitude below which the material will not fail for any number of cycles, called a fatigue limit or endurance limit. [25] However, in practice, several bodies of work done at greater numbers of cycles suggest that fatigue limits do not exist for any metals.
An important structural limitation of aluminium alloys is their lower fatigue strength compared to steel. In controlled laboratory conditions, steels display a fatigue limit, which is the stress amplitude below which no failures occur – the metal does not continue to weaken with extended stress cycles. Aluminium alloys do not have this lower ...
7075 aluminium alloy (AA7075) is an aluminium alloy with zinc as the primary alloying element. It has excellent mechanical properties and exhibits good ductility, high strength, toughness, and good resistance to fatigue.
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Aluminum, Al 89 Copper, Cu 2.3 Magnesium, Mg 2.3 Zinc, Zn 6.2 Zirconium, Zr 0.12 ... Fatigue strength 240 MPa Elastic modulus 70-80 GPa Poisson's ratio 0.33
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