Abstract
1. The fatigue strength of an assembly material under operating conditions can be evaluated more precisely on the basis of secondary fatigue curves obtained during programmed loading, from the change in the secondary fatigue limits and the sum of the relative durabilities. 2. A decrease in program stress for the alloys investigated led to a decrease in the sum of the relative durabilities; hardening of the material occurred with a small base (a<1). The linear hypotheses of damage summation thus yields too high a durability for a material or assembly under conditions similar to operating conditions. 3. The durability distribution for the alloys tested under programmed and steady state conditions at elevated temperatures can be described by a logarithmically normal rule and the scattering was the same for both types of loading.
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