由切应力互等定理可知，在截面边缘上各点处切应力方向必与圆周相切。
Based on shearing stress Theorem, we know that the shearing stress direction of all the spots on the edge of circular cross-section should be tangent to the circle.
节点轴向力、径向力均随时间的增加而减小，而且节点应力变化速率在中心区域小于圆周处。
The node axial force and radial force decreased with the time increased and the change rate of the node stress at the center was less than that at the circumference.
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