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자연과학
공학
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복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
AI 뷰어
Citeasy
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지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
이용수
초록· 키워드
Powder-bed uniformity in metal additive manufacturing has a significant impact on the melt-pool behavior, defect formation, dimensional accuracy, and surface quality. However, conventional offline flowability tests (Carney Hall flow test, tap density, and static angle of repose, AOR) are sensitive to measurement conditions and have limited predictive capability across machines and process settings. This study developed a DEM-based virtual testing framework for quantitative powder flowability assessment that uses the Edinburgh Elasto-Plastic Adhesion (EEPA) contact model to capture the cohesion and contact history effects. The Carney Hall flow and rotating drum tests were reproduced with geometry similar to that of the experimental apparatus, and the powder discharge was simulated using a particle size distribution. The deposited heap surface was extracted using an image-based post-processing, and the static and dynamic AOR were computed using linear fitting to ensure consistent definitions between the experiments and simulations. The results show that the EEPA-based DEM can accurately reproduce the friction–cohesion–rearrangement behavior under Carney Hall flow and rotating drum conditions, reducing the need for repeated experiments for powder batch screening and process-parameter exploration.
#Additive Manufacturing(적층제조)
#Metal Powder(금속분말)
#Flowability(유동도)
#DEM(이산요소법)
#Angle of Repose(안식각)
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목차
- ABSTRACT
- 1. Introduction
- 2. DEM Simulation
- 3. Static Flowability Evaluation Using the Carney Hall Flow Test
- 4. Dynamic Flowability Evaluation Using a Rotating Drum
- 5. Conclusion and Discussion
- REFERENCES
참고문헌
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