Demonstration of an endurance limit in cast 319 aluminum |
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| Authors: | M. J. Caton J. W. Jones H. Mayer S. Stanzl-Tschegg J. E. Allison |
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| Affiliation: | (1) the U.S. Air Force Research Laboratory, 45429-7817 Wright-Patterson AFB, OH;(2) the Department of Materials Science and Engineering, University of Michigan, 48109 Ann Arbor, MI;(3) the Institute of Meteorology and Physics, University of Agricultural Sciences, Vienna, Austria;(4) the Materials Science Department, Ford Research Laboratories, Ford Motor Company, 48124-2053 Dearborn, MI |
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| Abstract: | An investigation of the fatigue properties of cast W319-T7, an Al-Si-Cu alloy used in automotive engine components, was conducted using ultrasonic testing equipment with operating frequencies of 20 kHz. The stress-life (S-N) behavior at room temperature was determined for three solidification conditions of this alloy, where stresses for fatigue lives ranging from 105 to 109 cycles were determined. The results are compared to fatigue data acquired using servohydraulic equipment operating at 40 Hz. No influence of loading frequency has been observed. A discrete endurance limit is indicated for each of the three solidification conditions of W319-T7. The scientific and practical implications of this result are discussed. A material model presented previously is modified by introducing a crack growth threshold condition in order to predict the observed endurance limits. The model is shown to effectively predict the influence of solidification time on the fatigue properties of W319-T7. |
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