principal stress axis

The results found that: ( 1) the transverse corner field resulting from the uneven geometrical width of YBT model leads to the non-uniform spreads and distributions of the active lengthwise tensile stress, the stretchy strain and the passive transverse pressure stress in the principal axis;

由此得出：①YBT模型几何宽度不均匀所形成的横向角部区域，导致了主动型的纵向主轴拉应力和主轴伸长应变以及被动型的横向主轴压应力的不均匀传播与分布；

The principal compressional stress axis obtaind through focal mechanism solutions show NNE and NW orientations.

由震源机制解求出的主压应力轴为北北东向和北西向.

The three sets of equations deduced on the assumption that the principal axis of stress coincides with the axis of anisotropy for calculating limit strains in anisotropic, aeolotropic and isotropic sheet metal stretching are special solutions of the general equations.

假定应力主轴与各向异性轴重合的各向异性、厚向异性和各向同性等三组计算金属板材成形极限应变的方程均为普遍方程的一些特例。