2006, Volume 8, Issue 2
Strategic Study of CAE >> 2006, Volume 8, Issue 2
Influence of Tensile Overload on Fatigue Life of LC4CS Al-alloy After Corrosion
Department of Aeronautical Mechanism of Qingdao Branch , NAEI , Qingdao , Shandong 266041 , China
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Abstract
Having undergone accelerative calendar corrosion, a plate with a central hole of LC4CS alloy was subjected to constant amplitude cyclic loads after a tensile overload. From such an experiment, two points could be studied: the interaction between corrosion and overload, and the contribution of this interaction to fatigue life. The analysis of experiment data showed that when overload-ratio was fixed, the logarithm fatigue life of specimen linearly descended with the increase of corrosion degree, and the dispersion increased. For small overload-ratio, the contribution of corrosion and overload to fatigue life approximately canceled out. But for large overload-ratio, overload retardation notably prolonged fatigue life and corrosion before overload seemed to amplify the prolonging.
Keywords
LC4CS Al-alloy ; corrosion before loads ; overload ; fatigue life
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