一个水平等截面圆环(如图1),绕通过其圆心的垂直轴 o—o 以等角速度ω旋转,巳知材料的单位体积重量为 γ,弹性模量为 E,圆环的平均直径 D 远大于圆环的厚度t,以致可认为横截面积 A 不抵抗弯曲而只受拉力,试计算圆环由惯性载荷引起的直径改变. A horizontal cross-section ring (Figure 1) is rotated about the vertical axis o-o passing through its center at an equiangular velocity ω. It is known that the material has a unit weight of γ, an elastic modulus of E, an average diameter of the ring D Is much larger than the thickness t of the ring so that it can be assumed that the cross-sectional area A does not resist the bending but only the tensile force, and the diameter of the ring due to the inertial load changes.