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金属材料的疲劳性能特别是腐蚀疲劳性能的研究,在理论上和工程上具有重要意义,疲劳试样设计对疲劳试验结果有显著的影响。本文就具有双弧形边缘的板材弯曲疲劳试样进行了理论分析。结果指出,最大应力点处l_c=35.93mm,而不是28.58mm,即最大应力不在试样最小截面处。此结果与由断裂后试样的实际测量结果相符。基于这种分析结果,提出了板材弯曲疲劳等应力试样设计原理以及推荐试样的形状和尺寸。这种等应力试样在研究弯曲疲劳,尤其是在弯曲条件下研究疲劳过程中裂纹产生和扩展机理时,将显示出明显的优越性。
The fatigue properties of metallic materials, especially the corrosion fatigue properties, are of great theoretical and engineering significance. The design of fatigue specimens has a significant impact on the fatigue test results. In this paper, a theoretical analysis is made on the bending fatigue specimens with double arc edges. The results show that the maximum stress point l_c = 35.93mm, rather than 28.58mm, the maximum stress is not at the minimum cross-section of the sample. This result is consistent with the actual measurement of the specimen after fracture. Based on the results of this analysis, the design principle of stress specimen such as plate bending fatigue and the shape and size of the recommended sample are proposed. This kind of equal stress specimen will show obvious superiority when studying the bending fatigue, especially when studying the mechanism of fatigue crack growth and extension under bending conditions.