This work performs a detailed analysis of the cracks obtained in fretting fatigue tests with cylindrical contact in the presence of a small oscillatory rolling of the contact pad. To do so, fretting fatigue tests have been carried out. Preliminary observations indicate that the contact area is larger than the theoretical one according to Hertz’s theory. This could mean that, due to the contact geometry and the stiffness of the test setup, rolling of the contact pad is occurring during tests. To reproduce this phenomenon, a 2D numerical model is developed. The results are compared with actual crack profile measurements.

中文翻译：

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微动疲劳试验中接触垫滚动对裂纹萌生的影响

这项工作详细分析了在接触垫存在小振荡滚动的情况下，在圆柱接触的微动疲劳试验中获得的裂纹。为此，已经进行了微动疲劳试验。初步观察表明，接触面积大于赫兹理论的理论面积。这可能意味着，由于接触几何形状和测试装置的刚度，在测试期间会发生接触垫的滚动。为了重现这种现象，开发了一个二维数值模型。将结果与实际裂纹轮廓测量值进行比较。