Fatigue Test Results and Fatigue Life Estimation on Hard Steel and Aluminum Alloy under Random Loads

概要

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A mechanical type of random fatigue testing machine is improved so that random loads with arbitrary overall means can be applied to the specimens. Random fatigue tests are then carried out by the testing machine both on hard steel (S55C) and aluminum alloy (7075-T6) in order to examine the utility of the machine and to determine the fatigue strengths or the fatigue lives of both materials under service loads. Further, discussions are made about the appropriate methods both of load counting and of estimation of fatigue lives under service loads. Consequently, the full wave count method is proved to be very useful since the fatigue lives estimated by that method are closer to the actual lives, irrespective of the material and the extent of the irregularity of the original random load.
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