Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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A Study on Fatigue Life and Fatigue Crack Propagation Behavior of MMC

MMC의 피로수명과 피로균열전파거동에 관한 연구

  • 허선철 (경상대학교 수송기계공학부 해양산업연구소) ;
  • 박원조 (경상대학교 수송기계공학부 해양산업연구소) ;
  • 최용범 (경상대학교 수송기계공학부 대학원)
  • Published : 2002.12.01
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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

References

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