유한요소해석을 이용한 고압비틀림 공정 중의 구리 분말의 치밀화 및 고형화 거동 분석
Analyses of Densification and Consolidation of Copper Powders during High-Pressure Torsion Process Using Finite Element Method
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In this study, the behavior of densification of copper powders during high-pressure torsion (HPT) at roomtemperature is investigated using the finite element method. The simulation results show that the center of the workpieceis the first to reach the true density of copper during the compressive stage because the pressure is higher at thecenter than the periphery. Subsequently, whole workpiece reaches true density after compression due to the high pressure. In addition, the effective strain is increased along the radius during torsional stage. After one rotation, the peripheryshows that the effective strain is increased up to 25, which is extensive deformation. These high pressure and severestrain do not only play a key role in consolidation of copper powders but also make the matrix harder by grain refinement.
Abstract
In this study, the behavior of densification of copper powders during high-pressure torsion (HPT) at roomtemperature is investigated using the finite element method. The simulation results show that the center of the workpieceis the first to reach the true density of copper during the compressive stage because the pressure is higher at thecenter than the periphery. Subsequently, whole workpiece reaches true density after compression due to the high pressure. In addition, the effective strain is increased along the radius during torsional stage. After one rotation, the peripheryshows that the effective strain is increased up to 25, which is extensive deformation. These high pressure and severestrain do not only play a key role in consolidation of copper powders but also make the matrix harder by grain refinement.
참고문헌 (19)
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