Fatigue damage analysis under variable amplitude cyclingThis paper explores the suitability of a recently proposed mean stress parameter and introduces a nonlinear damage accumulation procedure. Data covering a range of positive and negative stress ratios from +0.6 to -2.66, for several aluminum alloys and steels, are assembled and shown to be well correlated by a simple damage parameter. A nonlinear damage accumulation postulate is advanced to replace the usual linear procedure. Results of critical experiments performed to assess the suitability of the postulate are introduced and shown to support a non-linear criterion. The implications of this work related to variable amplitude life prediction are discussed.
Document ID
19850029504
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Leis, B. N. (Battelle Columbus Labs. OH, United States)
Forte, T. P. (Battelle Columbus Laboratories Columbus, OH, United States)