| ▲ | harshreality 2 hours ago | |
No; roughly, yes. For practical engineering purposes, iron (steel) and titanium alloys have an endurance limit after which metal parts no longer degrade due purely to more cycles (on operationally-relevant timescales); aluminum and other metals, however, will continue to fatigue due to their chemical structures. Fatigue cracks in steel and titanium occur due to damage or improper manufacture, while metals like aluminum fatigue due to chemical structure degradation purely due to within-spec load cycles. > 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 small stress amplitudes. | ||