In this paper, rotating-bending fatigue tests of the SiC-whisker-reinforced 6061-T6 aluminum alloy and 6061-T6 aluminum alloy made by powder metallurgy were carried out to investigate the fatigue characteristics of plain and notched specimens at room temperature. The fatigue mechanisms in both materials were clarified through successive surface observations using the plastic replica method. In the case of the SiC-whisker-reinforced composites, there are whisker rich and poor zones and the fatigue crack is nucleated from the end of whiskers near the boundary. On the other hand, in the case of the aluminum alloy, the fatigue crack is nucleated from defects and propagates by shear. Moreover, the results were discussed based on linear notch mechanics.
|ジャーナル||Transactions of the Japan Society of Mechanical Engineers Series A|
|出版ステータス||出版済み - 1992|
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