The network of lines now conforms closely with a regular system of stress trajectories . 这些线所形成的网络与规则的主应力迹线族密切吻合。
2.
An apparent or pseudo change in the sign occurs when a stress trajectory passes through an isotropic point . 当一个主应力迹线通过一个各向同性点时，该符号会发生一个表面上的或虚假的改变。
3.
We may draw curves which have everywhere one of these directions for a tangent, these curves are called stress trajectory . 我们可以画一簇曲线，这簇曲线处处都有一个主方向作为切线，这些曲线叫做应力轨线。
