normal component

Adiabatic shear instability will take place when the normal component of particle velocity excesses critical value.

发生绝热剪切失稳的条件是入射速度的法向分最大于碰撞过程的临界速度.

If it is tangent to the circle it doesn't have any normal component.

如果相切的话，就不会有法向量方向的分量。

When a ferromagnetism items is under the application of stress, the phenomenon that the tangential component of magnetic leakage field has maximum value and that the normal component of magnetic leakage field changes polarity and acquires zero value at the stress concentration zone will take place.

铁磁性工件在受到应力作用时，在应力集中处会有漏磁场的切向分量出现最大值、同时法向分量改变符号且过零值点的现象。

The electric field which is produced by free surface charge on the interface lies in both ends of the interface and is added to original electric field in opposite direction, which results in normal component discontinuation of dielectric displacement vector.

界面上的自由面电荷所产生的电场，在界面两侧，以相反的方向叠加在原电场上，导致了电位移矢量的法向分量的不连续；

Normal component of fracture face is incorrectly calculated in the equation.

原因是该方程中裂缝面法向量的计算方法不正确。