SLIP LINE METHOD FOR SINTERED POWDER MATERIALS UNDER CONDITION OF AXIAL SYMMETRY DEFORMATION

Slip line method for sintered powder materials under condition of axial symmetry is proposed based on the simplified yield condition of sintered powder materials and Haar-von Karman perfect plastic criterion. The equations of slip line and stress along slip line are derived, and numerical solutions are given. Deformation load in closed die upsetting of sintered copper cylinder is calculated by slip line method, and theoretical solutions are compared with experimental results.

可压缩烧结材料轴对称变形上限元法(Ⅰ)

本文以质量不变条件为基础,提出了可压缩烧结材料轴对称变形的广义上限元法(UBET)。研究了矩形单元变形情况,导出了其动可容速度场和上限功率计算式,建立了上限优化模型。用广义 UBET 方法分析了烧结钢圆环光滑平板镦粗变形,并作了实验验证。

可压缩烧结材料轴对称变形上限元法(Ⅱ)

本文提出了可压缩烧结材料轴对称变形 UBET 方法的三角形单元,导出了其动可容速度场和上限功率计算式。应用可压缩烧结材料 UBET 方法分析了烧结铜轴对称挤压变形,并与实验结果作了比较。