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내부 결함을 포함한 주조 알루미늄 합금의 충격 거동 해석
조성우(Seong-Woo Jo),곽시영(Si-Young Kwak) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-2
주조공정에서 발생하는 수축공과 같은 내부 결함은 일반적으로 응력집중을 발생시키며 균열의 시작점이 되므로 충격과 같은 기계적 거동에 있어 결함의 영향을 이해하는 것이 중요하다. 본 연구는 주조 알루미늄 합금의 충격 거동에 대한 내부 수축 결함의 영향을 실험적 방법과 전산 해석을 이용하여 비교 및 평가하였다. 시편의 내부 결함은 주조 후 산업용 CT 장비를 통해 검출하였으며 추출된 결함은 형상단순화법에 의해 타원체로 단순화하고 충격 해석을 위한 전산 해석을 수행하였다. 그 결과 본 연구에서 제안한 방법으로 내부 결함을 포함한 주조품의 충격 거동을 실험과 유사하게 예측함을 확인할 수 있었다. In general, internal defects, such as shrinkage in casting, cause stress concentration and can be a starting point of crack. therefore, it is important to understand the effects of internal defects on mechanical properties including impact behavior. The objective of this research is to evaluate the internal casting defects on the impact performance of Al-ally castings. Both the experimental method and computational analysis were used to achieve the research objective. The internal defects in the casting were scanned by an industrial CI scanner, and its shape was simplified by ellipsoidal primitives for the impact analysis. The good agreement between the results obtained by experiments and computer simulations verified the reliability of the proposed method computational system for FEA of casting components with internal defects.
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내부 결함을 포함한 주조 알루미늄 합금의 충격 거동 해석
조성우(Seong-Woo Jo),곽시영(Si-Young Kwak) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.12
주조공정에서 발생하는 수축공과 같은 내부 결함은 일반적으로 응력집중을 발생시키며 균열의 시작점이 되므로 충격과 같은 기계적 거동에 있어 결함의 영향을 이해하는 것이 중요하다. 본 연구는 주조 알루미늄 합금의 충격 거동에 대한 내부 수축 결함의 영향을 실험적 방법과 전산 해석을 이용하여 비교 및 평가하였다. 시편의 내부 결함은 주조 후 산업용 CT 장비를 통해 검출하였으며 추출된 결함은 형상단순화법에 의해 타원체로 단순화하고 충격 해석을 위한 전산 해석을 수행하였다. 그 결과 본 연구에서 제안한 방법으로 내부 결함을 포함한 주조품의 충격 거동을 실험과 유사하게 예측함을 확인할 수 있었다. In general, internal defects, such as shrinkage in casting, cause stress concentration and can be a starting point for cracks. Therefore, it is important to understand the effects of internal defects on the mechanical properties including the impact behavior. This study aim is to evaluate the effects of internal casting defects on the impact performance of Al-alloy castings. Both an experimental method and computational analysis were used to achieve the research objective. The internal defects in the casting were scanned using an industrial CT scanner, and their shape was simplified using ellipsoidal primitives for impact analysis. The good agreement between the experimental and computer simulation results verified the reliability of the proposed computational method for the FEA of casting components with internal defects.
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A356 합금 시편의 수축공 결함형상에 대한 피로해석용 형상 모델링 방법
곽시영,조인성 한국주조공학회 2019 한국주조공학회지 Vol.39 No.1
During the casting process, it is possible to minimize shrinkage and blowholes by modifying the casting design. However, it is impossible to eliminate these factors completely. Therefore, mechanical design engineers apply a sufficient safety factor owing to the possibility of insufficient performances of the cast products. In this paper, prediction method of the fatigue life of cast products containing shrinkage is conducted by using CT (computed tomography) and the SSM (shape simplification method), and additional fatigue analyses are carried out. The analysis results are then compared to results from actual experiments on samples with shrinkage defects. It is found to be that the considering actual shrinkage in cast products by means of stress and fatigue analyses is more accurate and effective. It is also considered that the proposed hot spot method provides us a good tool to predict the fatigue lifes of cast product.
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내부 결함을 포함하는 알루미늄 합금 주조품의 피로해석을 위한 모델링
곽시영 ( Si Young Kwak ),황호영 ( Ho Young Hwang ),김학구 ( Hak Ku Kim ),이성원 ( Sung Won Lee ) 한국주조공학회 2010 한국주조공학회지 Vol.30 No.5
The structural stress and fatigue behavior of tensile specimen containing internal shrinkage defect were modeled. Real shrinkage defect in casting was scanned by industrial CT (computed tomography), and subsequently its shape was simplified by ellipsoidal primitives for the structural analysis (S.S.M., shape simplification method). The analysis results were compared with the results by real shrinkage shape without any simplification process. It was possible to consider real shrinkage of casting in stress analysis and the method to predict fatigue life of casting with defect was proposed.
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곽시영(Si-Young Kwak),임채호(Chae-Ho Lim),백재욱(Jae-Wook Baek) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Most structure engineers give the casting components over-estimated factor of safety without any reasonable foundation due to the worries about the unavoidable defects such as shrinkages and porosity in castings; the engineers have little knowledge on the relation between the defect and structural behavior. And the workers in casting field also do not know how to control the defects by manufacturing; they do not know to where the defects move or until how size they reduce the defects. In this study, shrinkage defect was scanned by industrial computerized tomography instrument (CT), and subsequently was modeled to a spheroid primitive for structural analysis. Using these simplified models of shrinkage, we observed the effects of the defect on the results of the structural analysis. A commercial structural analysis code was used to do the analysis works. Considering the conclusions, it is possible to manage the shrinkages effectively in casting process and to design the products with more reliable
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주조 구조물 수축공의 형상단순화 기법을 통한 정적하중에 대한 영향도 분석
곽시영(Si-Young Kwak),임채호(Chae-Ho Lim),백재욱(Jae-Wook Baek) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.8
Most structure engineers give the casting components over-estimated factor of safety without any reasonable foundation due to the worries about the unavoidable defects such as shrinkages and porosity in castings; the engineers have little knowledge on the relation between the defect and structural behavior. And the workers in casting field also do not know how to control the defects by manufacturing; they do not know to where the defects move or until how size they reduce the defects. In this study, shrinkage defect was scanned by industrial computerized tomography instrument (CT), and subsequently was modeled to a spheroid primitive for structural analysis. Using these simplified models of shrinkage, we observed the effects of the defect on the results of the structural analysis. A commercial structural analysis code was used to do the analysis works. Considering the conclusions, it is possible to manage the shrinkages effectively in casting process and to design the products with more reliable
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