关键词: 密度变化, 韧性损伤, 测量

Abstract: The relative demsity changes can phenomenologically reflect the ductile damage evolution during plastic deformation processes. In view of the above fact, the authors attempt to formulate a ductile damage model through precise measurement of the relative density changes in order to predict the ductile damage evolution and product quality for metal forming processes. However, the density changes during plastic deformation processes are very small. Therefore, the precise measurement of small density changes is the key to carrying out the project mentioned above. In this paper, the method and equipment for measuring small changes in density are described in detail. The ductile damage evolution during tension and torsion process is studied by measurement of the relative density changes. The results of this study indicate that the precise measurement of small changes in density is a promising way for understanding of the ductile damage evolution during plastic deformation processes.

Key words: density changes, ductile damage, measurement