Abstract: This paper inquires into the exportability of the fatigue measurements made on standard test-specimen to wire electro- discharge machined flexures with thin cross sections (50 $mu@m). It describes the results of a set of fatigue measurements made on 66 circular flexible hinges machined in steel and bronze by wire electro-discharge machining. After reminding the fatigue theory and describing the theoretical model used to calculate the stresses inside the bent hinges, the paper describes the experimental setup and the measured results. The main conclusions drawn out of this work is that the admissible stresses for the tested flexures having a low surface roughness (Ra $EQ 0.2 $mu@m) are at least as high as the admissible stresses for standard test specimens. This indicates that fatigue data found in literature can be used to calculate the dimensions of this kind of flexures without any reduction of the safety factor.!8
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机译：摘要：本文探讨了标准试样对标准试样的疲劳测量的可通货膨胀，以薄截面（50 $ MU @ M）。它描述了通过电线电放电加工加工在钢和青铜的66个圆形柔性铰链上进行的一组疲劳测量结果。在提醒疲劳理论并描述用于计算弯曲铰链内部应力的理论模型之后，本文描述了实验设置和测量结果。出于这项工作的主要结论是，具有低表面粗糙度的测试弯曲的可允许应力（RA $ EQ 0.2 $ MU @ M）至少与标准试样的可允许应力一样高。这表明文献中发现的疲劳数据可用于计算这种柔性的尺寸，而无需任何减少安全系数。！8
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