![]() Pronounced size effect in reversed bending and/or torsion than in the reversed axial loading Alternatively, since there appears to be a more When the size increases, the endurance decreases. This is possibly related to the probability of a high stress interacting with a critical flaw withinĪ certain volume, i.e., when the volume is large there is a higher probability of failure. The endurance limit of specimens have been observed to vary with their size. Other factors can also have a significant non-quantifiable effect on the fatigue strength of metals. The maximum completely reversed (shear)stress (from test specimen results) forĪll of the above factors have significant quantifiable negative effect on the (tensile) stress (from test specimen results) for which it is assumed that the material will never fail Which it is assumed that the material will never fail regardless The maximum fatigue limit (shear)stress for The material will never fail regardless of the number of cycles. Modified fatigue limit (tensile) stress for which it is assumed that ![]() Test specimen endurance/fatigue limit (shear) (Ferrous metals and titanium.) Modified endurance/fatigue limit (shear) (Ferrous metals and titanium.) Note: For metals which do not have a definite endurance limit e.g copper allows the endurance limts S' e, S' es etcĪre replaced by assumed endurance limits S' n, S' ns etc. = C s x C f x C l x C t x C r x C m x S' es / K f = C s x C f x C l x C t x C r x C m x S' e / K f ![]() The Modified fatigue endurance limit for, ferrous materials and titanium, is the endurance strength ( S' e ) identified from the relevant S-N ( Wohler) curve modified by a number of factors The MODIFIED endurance limit divided by the Stress Concentration factor (K f). The load experience by a component subject to fatigue loading must not exceed The links below the table provide more detailed information on fatigue design. Out using validated material information and with careful consideration of all factors relevant to the stress locations. Įvaluating the fatigue strength to be used for component design should be carried The information below is for guidance only. Fatigue Index Metal Fatigue and Endurance ![]()
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