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水轮发电机组的主轴,在工作中承受着拉伸应力和扭剪应力。一般在设计时令其小于某一允许值,才算是安全的。亦即相当应力:
Hydrogenerator main shaft, in work under tensile stress and torsional shear stress. Generally designed to make it less than a certain allowable value, can be considered safe. That is quite stressful: