三、平面曲梁中的应力计算公式 矩形横截面和圆形横截面的平面曲梁受作用于曲率平面的法向面内的载荷时的应力计算如下:将截面上的应力化到重心上,并沿t、n、b轴线分解(图20),图中 ——轴线的单位切线向量,方向沿梁横截面的外向法线; ——轴线的单位主法线向量,方向向曲率中心; Stress Calculation Formula in Planar Beams The stress of plane curved beam with rectangular cross section and circular cross section is affected by the load in the normal plane of the curvature plane as follows: And is decomposed along the t, n, b axis (Figure 20), in which - the unit tangent vector of the axis, the outward normal to the beam cross-section in direction; - the principal normal vector of the axis in the direction of the center of curvature;