We should draw stress circle according to the sign provision of material mechanics .
在画应力圆时，应按材料力学的符号规定。
This paper makes improvements on the methods of stress circle drawings. And this method can be used to calculate the strain and moment of inertia.
本文对应力圆图解法作了改进，使图解法更直观、更简便。并将改进后的图解法应用到应变、惯性矩计算中。
It is more convenient, simple and effective to analyze quality problem of compound deformation of sheet metal pressing parts by means of the concept of stress circle.
利用应力分界圆的概念，分析冲压件复合变形时产生的质量问题比较方便、简便和有效。
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