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本文基于“粘塑性流动理论”,求解了金属超塑性拉伸变形时粘塑性流动的力学平衡方程.得出了缩颈部位金属流动速度的解析式;从而应用应变速率敏感时塑性变形的稳定流动判据,对超塑性拉伸过程中的缩颈游动进行了力学分析.并用此理论解释了近几年发现的超塑性变速拉伸时延伸率显著增加的现象,试图为超塑性的进一步开发和应用提供新的启示,从能量的观点对超塑性变形行为进行新的解释.
In this paper, based on the “viscoplastic flow theory”, the mechanical equilibrium equations of viscoplastic flow in metal superplastic deformation are solved. The analytic formula of the flow velocity of the constricted neck metal is obtained. Therefore, the plastic deformation is stable when the strain rate is sensitive. The flow criterion analyzes the necking in the superplastic elongation process and uses this theory to explain the phenomenon that the elongation rate increases significantly during the superplastic deformation at the same time. It tries to further the superplasticity. Development and application provide new insights, from the energy point of view of the new superplastic deformation behavior.