A New Approach to Fatigue Damage Calculation
The paper presents a study of improving the accuracy of fatigue damage accumulation calculation. Weibull probability distribution is used for primary assessment of test data. A set of single-stress-level fatigue life distributions gives the basis of Manson-style two-step test series. Imaginary homogeneous test series are generated from the single stress-level Wohler curves. The equivalent load cycle number N* is introduced to damage calculation. High-low and low-high load orders require different formulae. After full development and trial analysis of a number of two-step test results, the procedure promises to give substantial improvement in the accuracy of fatigue life calculation, e.g. in finite-element programs.
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