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本文对轮缘在较短时间内产生疲劳损坏的原因进行探讨,主要提出轮缘的铆孔处应力集中和部分进汽度较大的轴向交变应力是发生疲劳损坏的直接原因,故对于叶轮单是以静力计算并考虑安全系数是不够的,还应考虑部分进汽轴向交变应力及铆孔处应力集中对疲劳强度的影响,以进行疲劳强度的验算。为了保证这类背压机安全运行,今后尚需进一步讨论研究,
In this paper, the cause of fatigue failure caused by wheel rim in a relatively short period of time is discussed. The stress concentration at the rivet hole and the axial alternating stress with large intake air degree are the direct causes of fatigue failure. Therefore, The impeller alone is not enough to calculate the static safety factor and consider the safety factor. It should also take into account the impact of axial stress and axial stress concentration on the fatigue strength of the steam inlet to check the fatigue strength. In order to ensure the safe operation of such back-pressure machine, in the future still need further discussion of research,