On Stress Interaction in Fatigue and a Cumulative Damage Rule

摘要: The paper presents the underlining physical concepts as well results of an investigation interaction repeated stress cycles variable amplitude in producing progressive (fatigue) damage. materials investigated were 2024 aluminum alloy and 4340 aircraft steel; applied load spectra based on simplified exponential distributions gust loads maneuver loads, suggested by Lundberg. fatigue tests performed rotating bending machines special design, which randomized sequences amplitudes, derived from given spectra, applied. support proposition a quasi-linear cumulative damage rule, deviating significantly simple linear (so-called Miner) but equally easy to apply design. They also demonstrate lack design significance conventional endurance limit ferrous metals.