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[quote user="erikem"]Keep in mind that "fatigue" usually applies to a wear-out mechanism for cyclic loading below the elastic limit. The theory is that such loading will generate micro-cracks that eventually lead to some cracks growing to the point that the piece fails.[/quote] The dimensioning for fatigue aims on preventing this scenario by limiting the allowable stresses. How much depends on e.g. number of load cycles, tension or compression or alternating. When ties loose their footing and don't support the rails anymore the fatigue is accelerated. The stresses will most likely stay within the elastic limits but the higher maximal stresses will reduce the number of allowed load cycles. Regards, Volker
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