Accurate and effective powder compaction analyses are performed for brittle materials such as graphite, utilized as a solid lubricant, by using the discrete element method (DEM). The reliability of the DEM analysis is confirmed by comparing the results of graphite powder compaction analyses using the DEM particle bonding contact model and particle non-bonding contact model with those from the powder compaction experiment under the same conditions. To improve the characteristics, the parameters influencing the compaction properties of the metal-graphite mixtures are explored. The compressibility increases as the size distribution of the graphite powder increases, where the shape of the graphite particles is uniform. The improved compaction characteristics of the metal-graphite (bonding model) mixtures are further verified by the stress transmission and compressive force distribution between the top and bottom punches. It is confirmed that the application of graphite (bonding model) powders resulted in improved stress transmission and compressive force distribution of 24% and 85%, respectively.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 토론
    3.1 Graphite Bonding, Non-bonding, Experiment 비교
    3.2 Graphite의 크기 범위 및 형상
    3.3 응력 전달 및 압축력 분산
4. 결 론
References

• 정준혁(한밭대학교 기계공학과) | Jun Hyeok Jeong (Hanbat National University, Mechanical Engineering)
• 최진일(한밭대학교 기계공학과) | Jinnil Choi (Hanbat National University, Mechanical Engineering) Corresponding Author