Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Estimation of Empirical Fatigue Crack Propagation Model of AZ31 Magnesium Alloys under Different Maximum Loads

최대하중 조건에 따른 AZ31 마그네슘합금의 실험적 피로균열전파모델 평가

  • Choi, Seon-Soon (Department of Car Mechatronics Engineering, SAHMYOOK University)
  • 최선순 (삼육대학교 카메카트로닉스학과)
  • Received : 2012.01.13
  • Accepted : 2012.02.10
  • Published : 2012.02.29
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Abstract

It is the aim of this paper to propose the empirical fatigue crack propagation model fit to describe a crack growth behavior of AZ31 magnesium alloys. The statistical data of a crack growth for an estimation are obtained by fatigue crack propagation tests under the three cases of maximum load. The empirical models estimated are Paris-Erdogan model, Walker model, Forman model, and modified-Forman model. It is found that the empirical model fit to describe a crack growth behavior of AZ31 magnesium alloys is Paris-Erdogan model and Walker model. It is also verified that a fatigue crack growth rate exponent of a empirical model is to be a material constant.

본 논문의 목적은 AZ31 마그네슘합금의 균열성장거동의 경향을 묘사할 수 있는 실험적 피로균열전파모델을 평가하여 적합한 모델을 제시하는 것이다. 3가지 최대하중 조건을 변화시키면서 피로균열전파실험을 수행하여 평가에 필요한 통계적 균열성장 데이터를 획득하였다. 평가에 사용된 실험적 모델은 Paris-Erdogan 모델, Walker 모델, Forman 모델, 수정된 Forman 모델이며, 각 모델의 파라미터를 통계적으로 추정하기 위하여 최우추정법을 사용하였다. 마그네슘합금의 균열성장거동의 경향을 잘 묘사하는 모델은 Paris-Erdogan 모델과 Walker 모델이며, 모델의 파라미터 중 피로균열성장속도지수는 재료상수가 될 수 있음을 밝혀내었다.

Keywords

References

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  1. Estimation of Empirical Fatigue Crack Propagation Model of AZ31 Magnesium Alloys under Different Specimen Thickness Conditions vol.15, pp.2, 2014, https://doi.org/10.5762/KAIS.2014.15.2.646