初始大主应力方向角对动强度影响显著，随角度的增大动强度逐渐降低。
The initial orientation Angle of the major principal stress has a significant influence on the dynamic strength: as the Angle increases, the dynamic strength decreases.
结果表明：随着初始主应力方向角的增大，轴向残余变形由压缩状态的正值逐渐过渡到伸长状态的负值。
The results show that: with the initial principal stress direction angle increases, the axial residual deformation from the compression state gradually transits to the elongation.
在应力偏张量主值三角函数解的基础上，推导了应力空间内主应力和主方向的通用解析解公式。
Based on the stress partial tensor's trigonometric function answer, the main stress and main direction are established in parsed currency formula, and some special answers and examples are discussed.
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