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1·The basic conceptions and construct methods of Mohr circle were introduced simply and popularily in this paper with some exercises and their explanations.

本文以浅显的方式解释摩尔圆的基本概念和作图方法，附带做些练习和解答。

2·The Mohr-Coulomb model is based on plotting Mohr's circle for states of stress at failure in the plane of the maximum and minimum principal stresses.

莫尔-库仑模式基于莫尔圆来判断最大和最小主应力平面上的破坏应力状态。

3·In 3-d stress space, simplified form of Mohr-Coulomb equivalent area circle yield criterion is derived by adopting analytic geometry method.

在三维应力空间，采用解析几何的方法，导出了莫尔-库仑等面积圆屈服准则的简化形式。