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A Study on Fatigue Life and Fatigue Crack Propagation Behavior of MMC  

허선철 (경상대학교 수송기계공학부 해양산업연구소)
박원조 (경상대학교 수송기계공학부 해양산업연구소)
최용범 (경상대학교 수송기계공학부 대학원)
Publication Information
Journal of the Korean Society for Precision Engineering / v.19, no.12, 2002 , pp. 127-133 More about this Journal
Abstract
The objective of this study is to investigate fatigue life and fatigue crack propagation behavior The experiment of fatigue life for MMC have been carried out for the stress ratio R＝0.1 at 20Hz. Fatigue lift limit of AC4CH alloy is about 70 ㎫ and Fatigue limit of MMC has been increment to 120 ㎫, therefore, fatigue limits of MMC is about 71 % higher than that of AC4CH alloy Crack propagation tests on half-size CT specimen of thickness 12.5mm were conducted by using sinusoidal waveform. The crack length was monitored by compliance method. Test conditions were at 0.1 and 0.05 of load ratio at 10Hz of loading frequency and test load was 2.3kN. The effects of stress ratio on the fatigue crack propagation behavior for MMC was discussed within the Paris law. As the results of this study, Fatigue crack propagation increased with increasing the load ratio.
Keywords
Metal matrix composite; Fatigue life; Fatigue crack propagation; Sinusoidal waveform;
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