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前文(见本刊1986年第4期——编注)已经利用密栅云纹法分析了杯形件冷挤时的变形状态,得到了杯形件冷挤时金属的真实流动模式、变形区外形和位移速度场,并由位移速度曲线作出了应变速度场。本文进一步研究精确处理位移速度场数据的方法,然后利用塑性理论由所得的应变速度场求变形区内各点的应力分布。一、位移速度场数据的处理及应变速度场的确定
The previous article (see our issue No. 4, 1986 - Compilation) has been used to analyze the deformation state of the cup-shaped pieces cold extrusion, the true flow pattern of the cup when cold extrusion, the deformation zone Shape and displacement velocity field, and the displacement velocity curve made of the strain rate field. This paper further studies the method of accurately processing displacement velocity field data, and then uses the plastic theory to get the stress distribution of each point in the deformation area from the obtained strain velocity field. First, the displacement velocity field data processing and determination of strain rate field