Abstract
Assuming the validity of the life fraction rule the life time is calculated for creep rupture of material subjected to tensile cyclic stress variation. Two cases are considered: a saw tooth stress-time profile with zero and non-zero holding period. The life times and hence the number of cycles at fracture can be predicted by means of values from the static stress-rupture diagram ( n, τ o, τ max ) and values characterizing the stress cycle ( a, ν, t H ). The calculations for zero holding period are compared to experiments performed on the stainless steel type: DIN 1.4970 at 700°C. Very good agreement is obtained for loading conditions leading to shorter rupture times.
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