密度变化与韧性损伤的关系

 通过精密测量相对密度化建立韧性损伤模型,以预测金属塑性加工过程中韧性损伤演化规律和产品质量。本文研究了精密测量微小密度的变化、介绍了测量方法和装置。通过测量相对密度变化对拉伸和扭转过程中韧性损伤演化规律进行了研究。

RELATIONSHIP BETWEEN DENSITY CHANGES AND DUCTILE DAMAGE

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.