二向应力状态主应力方向判别的两种简易方法

Two Easy Ways To Determine the Directions of the Principal Stresses In A Plane Stress State

当用解析法求二向应力状态的主应力时，主应力方向的判别是材料力学教学中的一个难点，本文介绍了两种简易方法使该问题的解决变为容易而且易予掌握。

When the analytical method is used in solving principal stresses, the determination of the principal stresses is a very difficult point in the teaching of mechanics of materials. In the paper, two easy ways have been introduced in which the problem can be easily soved. And it is very easy for students to rnaster the ways.