Defense Technical Information Center (DTIC) · 1961 · 90 citations · 2 references
EngineeringMaterials EngineeringMaterials ScienceMechanical Behavior Of MaterialsMetallurgyStructural MaterialsDamage MechanicsFatigueFracture MechanicsFracture PropagationStrength Of MaterialsStress-strain BehaviorAxial LoadsCrack PropagationCrack Propagation AnalysisCrack Propagation MechanismsFatigue Crack GrowthFatigue Crack PropagationFatigue TestingStress
A series of fatigue tests with specimens subjected to constant-amplitude and two-step axial loads were conducted on 12-in. wide sheet specimens of 2024-T3 and 7075-T6 aluminum alloy to study the effects of a change in stress level on fatigue-crack propagation. Comparison of the results of the tests in which the specimens were tested at first a high and then a low stress level with those of the constant-stress-amplitude tests indicated that crack propagation was generally delayed after the transition to the lower stress level. In the tests in which the specimens were tested at first a low and then a high stress level, crack propagation continued at the expected rate after the change in stress levels. (Author)
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H J Grover, W.S. Hyler, Paul J. Kühn et al. · University of North Texas Digital Library (University of North Texas) · 1954 · 40 citations · Full text
Engineering, Aerospace Engineering, Materials Engineering +16