对平面变形的正反向挤压问题建立运动许可的连续速度场并获得上界解析解。
A kinematically admissible continuous velocity field is established and applied to the plane strain in reversible extrusion.
该解与以运动许可的三角形速度场得到的上界解进行比较表明，有时本解法可得到更低的上界值。
Compared with that using a kimematically admissble triangular velocity field, the solution can give enen lower values than that of a kimematically admissble triangular velocity field sometimes.
本文重点对如何得到下一时刻的可行解进行了研究，指出了衰减系数的上界应满足的条件；
The paper emphasizes on how to get the feasible solution at next time and gives the condition that the decaying coefficient should satisfy.
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