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Reference.org
Fatigue limit
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<p>The fatigue limit or endurance limit is the <a href="/facts/Stress_(mechanics)/ErAXDbbd">stress</a> level below which an infinite number of loading cycles can be applied to a material without causing <a href="/facts/Fatigue_(material)/zmJY8hMt">fatigue</a> failure. Some metals such as <a href="/facts/Ferrous/AGImjWqq">ferrous</a> alloys and <a href="/facts/Titanium/53ArnDoy">titanium</a> alloys have a distinct limit, whereas others such as <a href="/facts/Aluminium/7wmR8jYE">aluminium</a> and <a href="/facts/Copper/I8PEE8oX">copper</a> do not and will eventually fail even from small stress amplitudes. Where materials do not have a distinct limit the term fatigue strength or endurance strength is used and is defined as <i>the maximum value of completely reversed bending stress that a material can withstand for a specified number of cycles without a fatigue failure</i>. For polymeric materials, the fatigue limit is also commonly known as the intrinsic strength. </p>